Question

how many terms will it take to get the sum 1046.5 in AP 7,10,14​

Answer 1

Answer:

a = 7

d = 3

Sn = 1046.5

Sn = 2a + (n - 1) x d

1046.5 = (2×7) + (n-1) × 3

1046.5= 14 + 3n - 3

1046.5 = 11 + 3n

1046.5 - 11 =3n

3n = 1035.5

n = 1035.5/3

n = 345.16

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