Question

1+4+7+10.find sum upto 30 terms.​

Answer 1

Answer:

Here a = 1 and d = 3

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

s30 = 30/2(2 × 1 + (30 - 1)3)

= 15(2 + 29 × 3)

= 15(2 + 87)

= 15 × 89

=1335

Hope it helps you!!

Answer 2

Answer:

your answer in this photo

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