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12 Feb 2018, 02:12
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
80% (01:54) correct
20%
(02:05)
wrong
based on 139
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[GMAT math practice question]
What is the least common multiple of 39, 91, 93 and 217?
A. 8461
B. 8462
C. 8463
D. 8464
E. 8465
What is the least common multiple of 39, 91, 93 and 217?
A. 8461
B. 8462
C. 8463
D. 8464
E. 8465
12 Feb 2018, 02:26
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MathRevolution
Prime-factorizing the numbers,
39 = 3*13
91 = 7*13
93 = 3*31
217 = 7*31
The LCM is 3*7*13*31 whose unit digit is 3 and the answer option ending 3 is 8463(Option C)
12 Feb 2018, 02:30
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Factor of 39 =3*13
............ 91= 7*13
............ 93= 3*31
............ 217= 7*31
Least Common Multiple is the highest power of all the factors: 3*7*13*31= 8463
Answer: C.
............ 91= 7*13
............ 93= 3*31
............ 217= 7*31
Least Common Multiple is the highest power of all the factors: 3*7*13*31= 8463
Answer: C.
