# HSC Commerce (Marathi Medium) 12th Standard Board Exam [इयत्ता १२ वि] - Maharashtra State Board Important Questions for Mathematics and Statistics

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Determine whether the following statement pattern is a tautology, contradiction, or contingency:

[(∼ p ∧ q) ∧ (q ∧ r)] ∧ (∼ q)

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Chapter: [0.01] Mathematical Logic
Concept: Statement Patterns and Logical Equivalence

Choose the correct alternative :

If p : He is intelligent.
q : He is strong
Then, symbolic form of statement “It is wrong that, he is intelligent or strong” is

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Truth Value of Statement

Choose the correct alternative:

Negation of p → (p ˅ ~q) is

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Logical Connective, Simple and Compound Statements

The dual of the statement (p ˅ q) ˄ (r ˅ s) is ______.

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Truth Value of Statement

Write the negation of the statement “An angle is a right angle if and only if it is of measure 90°”

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Logical Connective, Simple and Compound Statements

Examine whether the statement pattern

[p → (~ q ˅ r)] ↔ ~[p → (q → r)] is a tautology, contradiction or contingency.

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Statement Patterns and Logical Equivalence

Using truth table prove that p ˅ (q ˄ r) ≡ (p ˅ q) ˄ (p ˅ r).

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Truth Value of Statement

Complete the truth table.

 p q r q → r r → p (q → r) ˅ (r → p) T T T T square T T T F F square square T F T T square T T F F T square square F T T square F T F T F square T square F F T square F T F F F square T square

The given statement pattern is a square

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Statement Patterns and Logical Equivalence

If p ∨ q is true, then the truth value of ∼ p ∧ ∼ q is ______.

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Algebra of Statements

Write the converse, inverse, and contrapositive of the statement. "If 2 + 5 = 10, then 4 + 10 = 20."

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Chapter: [0.011000000000000001] Mathematical Logic
Concept: Logical Connective, Simple and Compound Statements

Determine whether the following statement pattern is a tautology, contradiction, or contingency:

[(∼ p ∧ q) ∧ (q ∧ r)] ∧ (∼ q)

Appears in 1 question paper
Chapter: [0.011000000000000001] Mathematical Logic
Concept: Statement Patterns and Logical Equivalence

The total cost of 3 T.V. and 2 V.C.R. is ₹ 35,000. The shopkeeper wants profit of ₹1000 per television and ₹ 500 per V.C.R. He can sell 2 T.V. and 1 V.C.R. and get the total revenue as ₹ 21,500. Find the cost price and the selling price of a T.V. and a V.C.R.

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Chapter: [0.012] Matrices
Concept: Application of Matrices

The sum of three numbers is 6. If we multiply third number by 3 and add it to the second number we get 11. By adding the first and third number we get a number which is double the second number. Use this information and find a system of linear equations. Find the three numbers using matrices.

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Chapter: [0.012] Matrices
Concept: Application of Matrices

Find matrices A and B, if 2"A" - "B" = [(6, -6, 0),(-4, 2, 1)] and "A" - 2"B" = [(3, 2, 8),(-2, 1, -7)]

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Chapter: [0.012] Matrices
Concept: Algebra of Matrices

If A2 + 5A + 3I = 0, |A| ≠ 0, then A–1 = ______

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Chapter: [0.012] Matrices
Concept: Application of Matrices

State whether the following statement is True or False:

If [(3, 0),(0, 2)][(x),(y)] = [(3),(2)], then x = 1 and y = – 1

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Chapter: [0.012] Matrices
Concept: Types of Matrices

If A = [aij]2×2, where aij = i – j, then A = ______

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Chapter: [0.012] Matrices
Concept: Inverse of Matrix

Find k, if A = [(3, -2),(4, -2)] and A2 = kA – 2I, where I is identity matrix of order 2

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Chapter: [0.012] Matrices
Concept: Algebra of Matrices

If A = [(2, 1),(0, 3),(1, -1)] and B = [(0, 3, 5),(1, -7, 2)], then verify (BA)T = ATBT

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Chapter: [0.012] Matrices
Concept: Properties of Matrices

Complete the following activity.

The cost of 4 kg potato, 3kg wheat and 2kg rice is ₹ 60. The cost of 1 kg potato, 2 kg wheat and 3kg rice is ₹ 45. The cost of 6 kg potato, 3 kg rice and 2 kg wheat is ₹ 70. Find the per kg cost of each item by matrix method.

Solution: Let the cost of potato, wheat and rice per kg be x, y and z respectively.

Therefore by given conditions,

4x + ( )y + 2( ) = ( )

x + 2y + ( )( ) = ( )

( )x + 2y + 3z = ( )

Matrix form of above equations is,

[("( )", 3, "( )"),(1, "( )", 3),("( )", 2, "( )")] [(x),(y),(z)] =[("( )"), (45), ("( )")]

R1 ↔ R2

[(1, 2, 3),("( )", "( )", "( )"),(6, 2, 3)] [(x),(y),(z)] =[("( )"), (60), ("( )")]

R2 – 4R1, R3 – 6R1

[(1, 2, 3),("( )", -5, "( )"),(0, "( )", -15)] [(x),(y),(z)] =[(45), ("( )"), (-200)]

(-1)/5 "R"_2, (-1)/5 "R"_3

[("( )", 2, 3),(0, "( )", 2),(0, 2, "( )")] [(x),("( )"),(z)] =[(45), (24), (40)]

R3 – 2R2

[(1, 2, 3),(0, 1, 2),(0, 0, -1)] [(x),(y),(z)] =[("( )"), ("( )"), ("( )")]

By pre multiplying we get,

x + 2y + ( )z = ( )    .....(i)

y + 2z = 24    ......(ii)

–z = ( )      ......(iii)

From (iii), we get, z = ( )

From (ii), we get, y = ( )

From (i), we get, x = ( )

Therefore the cost of Potato, Wheat and Rice per kg are _______, _______ and _______ respectively.

Appears in 1 question paper
Chapter: [0.012] Matrices
Concept: Application of Matrices
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