Question

5.52 + 62 + 72 + ... + 202​

Answer 1

Answer:

It forms an AP.

A = 52

A2 = 62

d = 10

An = 202

An = A + { n-1}d

202 = 52 + { n-1} 10

202 -52 = 10n - 10

150 + 10 = 10n

160/10 = n

16 = n

n = 16

Sn = n/2 [ A + L ]

Sn = 16/2 [ 52+202]

Sn = 8[ 254]

Sn = 2,032

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