Question

The sum 6^2 + 7^2 + 8^2+ ...... +15^2 is equal to

Answer 1

Given => a = 6² = 36

d = 7²-6² = 49-36 = 13

last term(l) = 15² = 225

hey likhne me thoda problem hoga mai aapko steps bata deta hu ok .

pehle n nikal lo

An = 2a+(n-1)d

upar wale formula se

fir iss n ko Sn ke formula me rakho fir answer aa jayega

Sn = n/2[2a+(n-1)d]

I hope aapko samaj aaya

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thank u