Question

Find the sum of first 15 terms

Answer 1

Answer:

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Solution:-

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Given-

a=1, d=1

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To find:-

S15=?

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formula to be used :-

Sn=n/2{2a+(n-1)d}

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Now solve,

ATQ

S15=15/2{2 x 1+(15-1)1}

=>15/2{2+14}

=>15 x 8

=>120

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hope helps✊

Answer 2

Answer:

checkout this attachment

hope it helps!!❤