I am trying to figure out how to simply a canonical sum of products expression that is from this expression: $ f_1(x_1,x_2,x_3) = \sum m (2,3,4,6,7) $ where m is canonical minterms
I got: $ \bar{x}_{1}x_2\bar{x}_3 + \bar{x}_{1}x_2x_3+x_1\bar{x}_{2}\bar{x}_{3}+x_1x_2\bar{x}_{3} + x_1x_2x_3 $
then I simplify and get: $ x_2+x_1x_2 $
which is incorrect. I the answer in the book is: $ x_2+x_1\bar{x}_{3} $