#prime implicants

Question

Let f(x$_{1}$,x$_{2}$,x$_{3}$,………,x$_{10}$)=1 if 5 or more variable equal to one ,then number of prime implicants are in f?

Comments

from where you got this question ?

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 notes=let f(x$_{1},x_{2}....................,x_{n}$) be equal to 1 iff k or more variable are equal to 1, the number of prime implicants in F are  $C\binom{n}{k}$

is made handbook one line