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Commerce (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Mathematics

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Mathematics
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If \[\frac{(2n)!}{3! (2n - 3)!}\]  and \[\frac{n!}{2! (n - 2)!}\]  are in the ratio 44 : 3, find n.

 

 

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

Prove that: 

\[\frac{n!}{(n - r)!}\] = n (n − 1) (n − 2) ... (n − (r − 1))
[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

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Prove that:

\[\frac{n!}{(n - r)! r!} + \frac{n!}{(n - r + 1)! (r - 1)!} = \frac{(n + 1)!}{r! (n - r + 1)!}\]

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

Prove that:

\[\frac{(2n + 1)!}{n!}\] = 2n [1 · 3 · 5 ... (2n − 1) (2n + 1)]
[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (5, r) = P (6, r − 1), find r ?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If 5 P(4, n) = 6. P (5, n − 1), find n ?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (n, 5) = 20. P(n, 3), find n ?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If nP4 = 360, find the value of n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (9, r) = 3024, find r.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P(11, r) = P (12, r − 1) find r.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (n, 4) = 12 . P (n, 2), find n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (n − 1, 3) : P (n, 4) = 1 : 9, find n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (2n − 1, n) : P (2n + 1, n − 1) = 22 : 7 find n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (n, 5) : P (n, 3) = 2 : 1, find n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

Prove that:1 . P (1, 1) + 2 . P (2, 2) + 3 . P (3, 3) + ... + n . P (nn) = P (n + 1, n + 1) − 1.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If P (15, r − 1) : P (16, r − 2) = 3 : 4, find r.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

If n +5Pn +1 =\[\frac{11 (n - 1)}{2}\]n +3Pn, find n.

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

In how many ways can five children stand in a queue?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

From among the 36 teachers in a school, one principal and one vice-principal are to be appointed. In how many ways can this be done?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined

Four letters E, K, S and V, one in each, were purchased from a plastic warehouse. How many ordered pairs of letters, to be used as initials, can be formed from them?

[6] Permutations and Combinations
Chapter: [6] Permutations and Combinations
Concept: undefined >> undefined
< prev  4581 to 4600 of 5493  next > 
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