Question

Find sum of the A.P. given below 34+32+30+......+10​

Answer 1

a = 34

d = (-2)

an = 10

an = a + (n - 1)d

10 = 34 + (n -1)(-2)

10 - 34 = -2n + 2

-24 = -2n + 2

2n = 24 + 2

2n = 26

n = 26/2 = 13

n = 13

Sn = n/2 ( a + an)

Sn = 13/2 ( 34 + 10)

Sn = 13/2 × 44

Sn = 13 × 22

Sn = 286

Sum of AP = 286

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Answer 2

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