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x^3 = n. If the units digit of n is a prime number, then ind
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05 Nov 2017, 01:55
05 Nov 2017, 01:55
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Question Stats:
54% (01:08) correct
45% (00:53) wrong based on 57 sessions
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\(x^3 = n\). 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.
[A] 1
[B] 2
[C] 3
[D] 5
[E] 7
[F] 8
[G] 9
Kudos for correct solution.
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Official Answer
C,D,E,F
Re: x^3 = n. If the units digit of n is a prime number, then ind
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05 Nov 2017, 03:08
05 Nov 2017, 03:08
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
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
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24 Aug 2019, 21:38
24 Aug 2019, 21:38
why not G?
