Question

if 1+4+7+10+.............+X =287,find the value of X
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Answer 1

hey friend your answer

a=1, d=3, Sn=287, n=?

Sn= 2a+(n-1)d

287=2×1+(n-1) 3

287-2=3n-3

285+3=3n

n=288/3

n=96

X=96

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Answer 2

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