N^M = -(1/64)
N=-4
M=-3
or
N=-64
M=-1
B cant be the OA.
It shud be C
ds -ve integer
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Source: Beat The GMAT — Data Sufficiency |
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aleph777
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The clue to the answer here is that the original question states that both M and N are negative numbers. Therefore, right of the bat, we know that negative * negative = positive, but positive * negative = negative.
Statement 1 is INSUF because you can reach 1/81 two ways:
-9^-2 (which is negative * negative) OR -3^-4 (which is negative * negative * negative * negative)
Statement 2 is SUF because there's only one combination that will yield a -(1/64):
-8^-2 = 1/64 BUT -4^3 = -(1/64)
Statement 1 is INSUF because you can reach 1/81 two ways:
-9^-2 (which is negative * negative) OR -3^-4 (which is negative * negative * negative * negative)
Statement 2 is SUF because there's only one combination that will yield a -(1/64):
-8^-2 = 1/64 BUT -4^3 = -(1/64)
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AIM GMAT
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Wow !! Thanks aleph777 and jaxis as well as advita for this question , i also went with C .Now i know where i was mistaken . Silly makes me go crazy .... i will keep this in mind .
Thanks & Regards,
AIM GMAT
AIM GMAT
hi guys... thanks all.
but i still doubt how it is B.
Q:If m and n are negative integers, what is the value of (mn)?
(1) m^n = 1/81
(2) n^m =-(1/64)
as jaxis told:
2. consider n=-4 m=-3 so n^m=-1/64. ==> mn=12
if n= -64, m= -1, so n^m=-1/64 ==> mn=64.
so how it can be B.
1. m=-9,n=-2 or m=-3 , n=-4
so isn't it should be E.
pl confirm. thanks.
but i still doubt how it is B.
Q:If m and n are negative integers, what is the value of (mn)?
(1) m^n = 1/81
(2) n^m =-(1/64)
as jaxis told:
2. consider n=-4 m=-3 so n^m=-1/64. ==> mn=12
if n= -64, m= -1, so n^m=-1/64 ==> mn=64.
so how it can be B.
1. m=-9,n=-2 or m=-3 , n=-4
so isn't it should be E.
pl confirm. thanks.
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samrendra4u
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advita wrote:If m and n are negative integers, what is the value of (mn)?
(1) m^n = 1/81
(2) n^m =-(1/64)
i doubt for B...Oa is B..
pl explain your choice.
It should be B.
