Question

Find the sum of first 30 terms of the AP :1+5+ 9+13+........

Answer 1

Answer:

1770

Step-by-step explanation:

a = 1

d = 4

n = 30

Let S be the sum of the AP

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

   = 30 / 2 x [2(1) + 4(30 - 1)]

   = 15 x [2 + 116]

   = 15 x 118

S = 1770

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