The first four terms in a sequence are $2, 6, 18, 54$. Find an expression, in terms of $n$, for

Question

The first four terms in a sequence are $2, 6, 18, 54$. Find an expression, in terms of $n$, for the $n$th term of the sequence.[1] Explain why the number $98 \ 415$ is not a term of the sequence. [1]

Accepted Answer

(a) $2(3^{n-1})$ (b) $98415$ is odd

2025 MSHS PRELIMS P1 Q8

2025 MSHS PRELIMS P1 Q8

Solution:

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