Question

Find the sum of ap 1,4,7,10

Answer 1

Answer:

sum of n terms in AP is

$\frac{n}{2} (2a + (n - 1)d)$

n=4,a=1,d=4-1=3

4/2(2(1)+3(3))

=2(2+9)

=2(11)=22

Answer 2

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1+4+7+10 = 12 +10 =22

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