If a=6 and d=3 find 516
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a=6 d=3 n=? an=5160
an=a+(n-1)d
516=6+(n-1)3
516-6=(n-1)3
510=(n-1)3
510/3=n-1
170+1=n
n=171 ans
I hope you it's is help ful to us
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