Question

Without actual calculation, finding the sums 13+15+17+19+21+23.​

Answer 1

Answer:

108

is the answer

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Answer 2

the numbers 13 , 15 , 17 ,19 , 21 ,23 are in AP

and have common difference as (15-13=2) 2

using sum on n terms in an AP formula

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

here a=13

d=2

n= 6

$\frac{6}{2} (2 \times 13 + (6 - 1)2) \\ \\ 3(26 + 10) \\ \\ 36(3) \\ \red{\boxed{sum = 108}}$

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