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20 May 2018, 11:40
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
86% (00:38) correct
14%
(00:39)
wrong
based on 255
sessions
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Date
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What is the sum of the unique prime factors of 126?
A. 9
B. 12
C. 15
D. 18
E. 24
A. 9
B. 12
C. 15
D. 18
E. 24
20 May 2018, 12:41
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Solution
To find:
• The sum of the unique prime factors of 126
Approach and Working:
• We can write 126 in terms of its prime factors as \(2 * 3^2 * 7\)
- o The prime factors of 126 are 2, 3, and 7
Hence, the correct answer is option B.
Answer: B
20 May 2018, 20:06
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Number of prime factors of 126
126 can be factorized as 2*3*3*7 = 2*3^2*7
Number of prime factors = 2+3+7 = 12
Ans: B
126 can be factorized as 2*3*3*7 = 2*3^2*7
Number of prime factors = 2+3+7 = 12
Ans: B
