1.

2, 7, 12, 17,....Sum ofthe 12 terms of this A. P. is​

Answer»

ANSWER:

a = 2

d = 7-2 = 5

s12 = 12/2 [2a + (n-1)d]

= 6(2×2 + 11×5)

= 6(4+55)

= 6(59)

= 359

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