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Senior Manager Joined: 20 May 2014
Posts: 282
Followers: 18

Kudos [?]: 50 , given: 220

x^3 = n. If the units digit of n is a prime number, then ind [#permalink] 00:00

Question Stats: 12% (01:32) correct 87% (00:26) wrong based on 8 sessions
x^3 = n. If the units digit of n is a prime number, then indicate each of the following that could be the value of x.

[A] 1

[B] 2

[C] 3

[D] 5

[E] 7

[F] 8

[G] 9

Kudos for correct solution.

[Reveal] Spoiler: OA
[C], [D], [E], [F]
[Reveal] Spoiler: OA
Director Joined: 03 Sep 2017
Posts: 520
Followers: 1

Kudos [?]: 356 , given: 66

Re: x^3 = n. If the units digit of n is a prime number, then ind [#permalink]
One digit prime numbers are 2, 3, 5 and 7. Thus, we should try which of the choices to the third power results in a unit digit equal to these four numbers.

This is the case for 3 (3^3 = 27), 5 (5^3 = 125), 7 (7^3 = 343) and 8 (8^3 = 512). Answers C, D, E and F Re: x^3 = n. If the units digit of n is a prime number, then ind   [#permalink] 05 Nov 2017, 03:08
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