Free GMAT Practice Question

Question 1 of 1
ID: GMAT-PSQ-035
Section: Quantitative Reasoning - Problem Solving
Topic: Even/Odd/Prime numbers
Difficulty level: Medium

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What is the largest possible positive integer value of $a$ that satisfies $a^2 = 215 - 5b$; where $b$ is a prime number?

A3
B5
C10
D17
E23
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