If $x$ is a positive integer, then is $x$ prime?

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Wed Jul 22, 2020 12:10 pm

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If $x$ is a positive integer, then is $x$ prime?

(1) $3x + 1$ is prime
(2) $5x + 1$ is prime

[spoiler]OA=E[/spoiler]

Source: Official Guide

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Source: Beat The GMAT — Data Sufficiency | Wed Jul 22, 2020 12:10 pm

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