Digital Logic Doubt

Question

The number of minterms covered by Essential Prime Implicants in the function f(a,b,c,d)=Σ(1,2,4,5,6,7,8,9,10,11,12,15) is
Answer is 0.While my answer is coming 2.

Comments

0 is correct show which is EPI. write the EPI term

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Essential Prime Implicants =0

Answer 1

$F(A,B,C,D)=\sum (1,2,4,5,6,7,8,9,10,11,12,15)$

There is no minterm which is covered by essential prime implicant.

Hence 0 is correct answer

Comments

I missed the pairs (9,1) and (10,3), thanks for the diagram.Got it.

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Your welcome, by the way it's (10,2) :p