Which Digit(s) makes 3,71[_] divisible by 3?
a. 3 only
b. 7 only
c. 1 only
d. 1,4, and 7
i really need help it counts as my grade!
the sum of the digits must be a multiple of 3, so
3+7+1 = 11
So, the other digit can be 1, making 3711 = 3*1237
4 and 7 will also work, since they are of the form 1+3k