Question

sum of series 3 +7+11+15.............. to 30 term is​

Answer 1

this series is in AP as common difference is same

so, d = 4

a = 3

n = 30

by using the formula

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

Sn = 30/2(2×3+(30-1)4)

Sn = 15 ( 6 + 29 × 4)

Sn = 15 ( 6 +116)

Sn = 15 (122)

Sn =1830

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Answer 2

Answer:

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