3 years ago

Please help me with this problem

1 answer:

8 0

Put 5 where n is in the formula and do the arithmetic. I find it convenient to rewrite the formula to make evaluation simpler.

$a_n=((n+1)n-9)n-9\\\\a_5=((5+1)5-9)5-9=21\cdot 5-9=\bf{96}$

... matches the 2nd choice

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