Multiple choice

A bag contains $23$ balls in which $7$ are identical. Then find the number of ways of selecting $12$ balls from bag.

$\space ^{18}C_7 + \space ^{18}C_8$
$\space ^{18}C_6 + \space ^{18}C_8$
$\space ^{18}C_12 + \space ^{18}C_8$
$\space ^{18}C_12 + \space ^{18}C_7$

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