# GATE Papers >> CSE >> 2018 >> Question No 59

Question No. 59

Consider the minterm list form of a Boolean function F given below.

$\style{font-family:'Times New Roman'}{F\left(P,Q,R,S\right)=\sum m\left(0,2,5,7,9,11\right)+d\left(3,8,10,12,14\right)}$

Here, m denotes a minterm and d denotes a don’t care term. The number of essential prime implicants of the function F is ______.