Question

The 7-digit numbers 74A52B1 and 326AB4C are each multiples of 3. Which of the following could be the value C?

Answer 1

74A52B1 and 326AB4C are multiples of 3.....That means if we divide them by 3, we should get a whole number. 

Lets assume A=1 and B=1, 
So,
74A52B1 becomes 7415211

Now, lets divide it by 3.
7415211 / 3 = 2471737

Since we got a whole number as a quotient, we can safely say that A=1 and B=1.

∴ The second number 326AB4C becomes 326114C.

Now, lets assume C = 1.
So,
326114C  becomes 3261141.
Now, 
lets divide it by 3.

3261141 / 3 = 1087047

Since we got a whole number as a quotient, C = 1

∴The value of C is 1. So, answer choice A is correct.