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24 Jan 2018, 01:36
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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:
15%
(low)
Question Stats:
86% (01:26) correct
14%
(01:39)
wrong
based on 100
sessions
History
Date
Time
Result
Not Attempted Yet
[GMAT math practice question]
What is the least common multiple of 6, 12, 20, 30 and 42?
A. 120
B. 180
C. 240
D. 360
E. 420
What is the least common multiple of 6, 12, 20, 30 and 42?
A. 120
B. 180
C. 240
D. 360
E. 420
24 Jan 2018, 02:15
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MathRevolution
A straight answer..
42 is the biggest number amongst all 5 numbers and the answer has to be a MULTIPLE of 42 and should have a 0 in the units digit..
Answer canbe 42*5=210(not given) and next 42*10=420..given
E
Otherwise proper method
6=2*3...
\(12=2^2*3\)..
\(20=2^2*5\)..
\(30=2*3*5\)..
\(42=2*3*7\)..
Take max power of each PRIME factor.
LCM=\(2^2*3*5*7=420\)
E
24 Jan 2018, 02:39
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MathRevolution
Check the options provided is straight (E) as reached by chetan2u
