If c and d are integers, is c even?

a. c(d+1) is even

b. (c+2)(d+2) is ev

1) cd+c=even, well we dont anything here c could be even.. or odd,

2) again same thing cd+2c+2d+4=even

together

cd+c=even, ok..even+c+2d=even

we know that 2d is even, even+c=even, which means C has to be even

C it is

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