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The number of 5 card combinations out of a deck of 52 cards if there is exactly one are in each combination is
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$778320$
Number of selection of 5 cards out 52 cards in each combination there is exactly one ace.
$\begin{aligned} & =4_{\mathrm{cl}} \times 48_{\mathrm{c} 4}=\frac{4 \times 48 \times 47 \times 46 \times 45}{4 \times 3 \times 2 \times 1} \\ & =778320\end{aligned}$
$\begin{aligned} & =4_{\mathrm{cl}} \times 48_{\mathrm{c} 4}=\frac{4 \times 48 \times 47 \times 46 \times 45}{4 \times 3 \times 2 \times 1} \\ & =778320\end{aligned}$
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