Data Sufficiency

chaitanya.mehrotra wrote:If c and d are integers is c even ?

1) c(d+1) is even
2) (c+2)(d+4) is even

• 1. c is even, (d + 1) is odd --> c and d both even
  2. c is odd, (d + 1) is even --> c and d both odd
  3. c and (d + 1) both even --> c even, d odd

• 1. (c + 2) is even, (d + 4) is odd --> c even, d odd
  2. (c + 2) is odd, (d + 4) is even --> c is odd, d even
  3. both (c + 2) and (d + 4) are even --> c and d both even