6.Permutation and Combination
medium

$52$ પત્તાને ચાર બાળકોમાં કેટલી રીતે વહેચી શકાય કે જેથી ત્રણ બાળકો પાસે $17$ પત્તા આવે અને ચોથા બાળક પાસે ફક્ત એક પત્તુ આવે.

A

$\frac{{52\;!}}{{{{(17\;!)}^3}}}$

B

$52\;!$

C

$\frac{{52\;!}}{{17\;!}}$

D

એકપણ નહિ.

(IIT-1979)

Solution

(a) For the first set number of ways $^{52}{C_{17}}$.

Now out of $35$ cards left $17$ cards can be put for second in $^{35}{C_{17}}$ ways similarly for $3$ rd in $^{18}{C_{17}}$.

One card for the last set can be put in only one way.

Therefore the required number of ways for the proper distribution

$ = \frac{{52\,!}}{{35\,!\,17\,!}} \times \frac{{35\,!}}{{18\,!\,17\,!}} \times \frac{{18\,!}}{{17\,!\,1\,!}} \times 1\,! = \frac{{52\,!}}{{{{(17\,!)}^3}}}$.

Standard 11
Mathematics

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