cant seem to do this question. Don't understand what the sigma means in this
2 Find the sum of products expression for the following functions and
implement using NAND gates.
F(A,B,C) = Ʃ0,1,3,4,6,7
F(A,B,C,D) = Ʃ 0,1,2,3,7,8,9,11,12,15
F(P,Q,R,S) = Ʃ 0,4,5,6,7,8,9,10
2 Find the sum of products expression for the following functions and
implement using NAND gates.
F(A,B,C) = Ʃ0,1,3,4,6,7
F(A,B,C,D) = Ʃ 0,1,2,3,7,8,9,11,12,15
F(P,Q,R,S) = Ʃ 0,4,5,6,7,8,9,10