There are $15$ persons in a party and each person shake hand with another, then total number of hand shakes is
There are $15$ persons in a party and each person shake hand with another, then total number of hand shakes is
- A
$^{15}{P_2}$
- B
$^{15}{C_2}$
- C
$15\,!$
- D
$2\,(15\,!)$
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