Multiple choice general knowledge math & puzzles

a, b, c and d are numbers of different values such that a + b = d and a*b*c = 0 Which of the 4 numbers must be equal to 0?

  1. b

  2. d

  3. c

  4. none

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since a, b, c, and d are different numbers and a*b*c = 0, one of them must be 0. Because a + b = d, if a or b were 0, then d would equal the other number, violating the 'different values' constraint. Therefore, c must be 0.