given a number series is 2,5,16,64,326 one term is wrong find the wrong term

the correct term required is 16 or 17 or 65 or 327
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1 Answer

an=(n+1)an-1+1, n0=2; so a1=2×2+1=5; a2=3×5+1=16; a3=4×16+1=65; a4=5×65+1=326.

Series: 2,5,16,65,326. 64 is the odd one out.

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