The sum of the first 20 terms of the sequence an=7n+2 is

Sum of the first 20 terms = 1510

Step-by-step explanation:

a₂₀ = 7*20 + 2 = 142

This is an Arithmetic progression, a = 9,   last term = 142

Sum of the 20 terms using:  n/2(a + l)      where l = last term.

=  20/2(9 + 142)

= 10 * 151

1510 hope ths helps

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step-by-step explanation:

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