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14.Probability
medium
Cards are drawn one by one without replacement from a pack of $52$ cards. The probability that $10$ cards will precede the first ace is
A
$\frac{{241}}{{1456}}$
B
$\frac{{164}}{{4165}}$
C
$\frac{{451}}{{884}}$
D
None of these
Solution
(b) There are four aces and $48$ other cards.
Therefore the required probability
$ = \frac{{48 \cdot 47 \cdot …. \cdot 39}}{{52 \cdot 51 \cdot …. \cdot 43}}.\frac{4}{{42}} = \frac{{164}}{{4165}}.$
Standard 11
Mathematics