Free Practice Question
PS · Problem Solving
605-655
Number Properties
How many trailing Zeroes does 49! + 50! have?
Answer Choices
Correct answer marked belowA
9
10
Correct
C
11
D
12
E
22
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Explanation
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What it tests
Your command of divisibility, primes, factors, parity, and how the GMAT tests properties of integers.
Common trap
Forgetting that 1 is not prime, that 0 is divisible by every integer, or that negative numbers flip your assumptions.
Details
Difficulty
605-655
Type
PS
Category