Let $A=\{1,2,3 \ldots \ldots, n\}$ and $B=\{a, b\}$ if the number of onto functions from $A$ to $B$ is 62 , then the number of subsets of $A$ containing exactly three elements is

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Let $A=\{1,2,3 \ldots \ldots, n\}$ and $B=\{a, b\}$ if the number of onto functions from $A$ to $B$ is 62 ,…

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