MathRevolution wrote:
[GMAT math practice question]
What is the units digit of the product of any five consecutive positive integers?
A. 0
B. 2
C. 4
D. 6
E. 8
Since we know that the product of 5 consecutive integers will always have prime factors of 2 and 5, the units digit of that product will always end in a zero.
Alternate solution:
Since the product of any five consecutive positive integers is divisible by 5! = 120, then the units digit of the product must be 0.
Answer: A
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