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22 Nov 2016, 04:41
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
71% (00:55) correct
29%
(01:05)
wrong
based on 165
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If a positive integer x has 5 prime factors, how many prime factors does 3x have?
A) 3
B) 5
C) 8
D) 15
E) cannot be determined
A) 3
B) 5
C) 8
D) 15
E) cannot be determined
22 Nov 2016, 04:57
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stonecold
If 3 is a factor of x, then 3x will have as many prime factors as x but if 3 is not a factor of x, then 3x will have one more prime than x.
Answer: E.
01 Dec 2017, 13:15
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Bunuel
But how come? if suppose 3 is a factor of x already, then still there'll be an addition to the total no. of prime factors by 1 more if x is multiplied by 3, since the question hasn't mentioned distinct prime factors.
But how come? if suppose 3 is a factor of x already, then still there'll be an addition to the total no. of prime factors by 1 more if x is multiplied by 3, since the question hasn't mentioned distinct prime factors.
