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 = 149Tn = 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

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#### APPEARS IN

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 = 149Tn = a + (N-1) D ∴ 149 =[ ] ∴149 = 2n - [ ]∴ N =[ ] Concept: Sum of First n Terms of an AP.
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