Respuesta :

Your question transforms to finding the following sum : 3 + 7 + 11 + 15.... upto 15 terms

Use formula for sum of an AP series

S = (n * (2a + (n - 1)d)) / 2

n -> no of terms in AP series , so n = 15
a -> first term in series, so a = 3
d -> common difference, so d = 4

Put all values for a, n, d and you will get the sum.

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