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Find the number of literals in minimal SOP for the function f(a,b,c,d)=π(0,1,2,6,8,10,11,12)

 sol:

f(a,b,c,d)=Σ(3,4,5,7,9,13,14,15)
Minimal SOP is    a’cd+ac’d+abc+a’bc’   

a’ (b+b')cd+a(b+b') c’d+abc (d+d')+a’bc’(d+d')+bd(a+a')(c+c')

2+2+2+2+4=12

this is right solution?

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