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19 Jan 2017, 08:05
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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:
75%
(hard)
Question Stats:
38% (01:36) correct
62%
(01:39)
wrong
based on 159
sessions
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If m, n and p are digits and their product is a digit, what is value of the product mnp?
(1) mn = 8
(2) m = 2n and n = 2p
(1) mn = 8
(2) m = 2n and n = 2p
19 Jan 2017, 09:40
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mnp = ?
St1: mn = 8 --> p can be 1 or 0.
mnp = 8 or mnp = 0
Not Sufficient.
St2: m = 2n and n = 2p --> mnp = 8(p^3) = 1 or 0.
Not Sufficient.
Combining St1 and St2, mn = 8 --> m or n cannot be 0 --> Hence p cannot be 0 --> mnp = 8.
Sufficient.
Answer: C
St1: mn = 8 --> p can be 1 or 0.
mnp = 8 or mnp = 0
Not Sufficient.
St2: m = 2n and n = 2p --> mnp = 8(p^3) = 1 or 0.
Not Sufficient.
Combining St1 and St2, mn = 8 --> m or n cannot be 0 --> Hence p cannot be 0 --> mnp = 8.
Sufficient.
Answer: C
19 Jan 2017, 14:12
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Hi,
mnp=?
st1: as it doesn't give us the value for P it is not sufficient. for ex for p=0 mnp=0, and for p=1, mnp=8.
st2: it doesn't reveal any real value for any of variables so it is not sufficient.
st1+st2: m=2n=2(2p)=4p & mn=8=4p*2p=8p^2 therefore we have p=+1 or -1 . for p=-1, mnp=-8 & for p=1 mnp=8 which is not sufficient.
answer is E.
mnp=?
st1: as it doesn't give us the value for P it is not sufficient. for ex for p=0 mnp=0, and for p=1, mnp=8.
st2: it doesn't reveal any real value for any of variables so it is not sufficient.
st1+st2: m=2n=2(2p)=4p & mn=8=4p*2p=8p^2 therefore we have p=+1 or -1 . for p=-1, mnp=-8 & for p=1 mnp=8 which is not sufficient.
answer is E.
