thr15th term of A.P:x-7,x-2,x+3,...
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since a = x-7
d = x-2-x+7 = 5
so a₁₅ = a+14d
= x-7+14 multiply by 5
= x-7 + 70
= x+63
d = x-2-x+7 = 5
so a₁₅ = a+14d
= x-7+14 multiply by 5
= x-7 + 70
= x+63
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