SSC (Marathi Semi-English) 10thMaharashtra State Board
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Fill up the Boxes and Find Out the Number of Terms in the A.P.1,3,5,....,149 .Here a = 1 , D =B`[ ], T_N = 149`Tn = a + (N-1) D ∴ 149 =`[ ] ∴149 = 2n - [ ]`∴ N =`[ ]` - SSC (Marathi Semi-English) 10th - Algebra

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Question

Fill up the boxes and find out the number of terms in the A.P.
1,3,5,....,149 .

Here a = 1 , d =b`[    ], t_n = 149`

tn = a + (n-1) d 

∴ 149 =`[  ]     ∴149 = 2n -  [  ]`
∴ n =`[  ]`

 

Solution

In the A.P. 1,3,5,....,149
a = 1 , d = 2 , tn = 149

tn = a + (n-1)d
149 = 1+ (n-1) × 2
149 = 1 + 2n -2
149 = 2n - 1
∴ 2n = 150
∴ n = 75 

  Is there an error in this question or solution?
Solution Fill up the Boxes and Find Out the Number of Terms in the A.P.1,3,5,....,149 .Here a = 1 , D =B`[ ], T_N = 149`Tn = a + (N-1) D ∴ 149 =`[ ] ∴149 = 2n - [ ]`∴ N =`[ ]` Concept: Sum of First n Terms of an AP.
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