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03 Jul 2006, 19:34
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Just for practice..
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03 Jul 2006, 20:49
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26. D
st. 1
if m^2=integer, this means m=integer. Suff.
st. 2
if sqrt(m)=integer, means that m=perfect square. Though +ve and -ve.
Suff.
-------------------------------------
27. C
P(not M) = 1-1/4=3/4
P(not P) = 1-2/5 = 3/5
P(not W) = 1-3/8=5/8
P(no one getting it right) = (3/4)*(3/5)*(5/8) = 9/32
therefore, at least one getting it right = 1-9/32 = 23/32
st. 1
if m^2=integer, this means m=integer. Suff.
st. 2
if sqrt(m)=integer, means that m=perfect square. Though +ve and -ve.
Suff.
-------------------------------------
27. C
P(not M) = 1-1/4=3/4
P(not P) = 1-2/5 = 3/5
P(not W) = 1-3/8=5/8
P(no one getting it right) = (3/4)*(3/5)*(5/8) = 9/32
therefore, at least one getting it right = 1-9/32 = 23/32
03 Jul 2006, 23:37
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Q26.
B
St1: Say m^2= 8 then m is not an integer and m^3 will also be a non-integer. Say m^2 = 9 then m is an integer and m^3 will be an integer.: INSUFF
St2: if SQRT(m) is an integer then m will always be an integer and m^3 will always be an integer.: SUFF
Q27.
C
Prob of all getting wrong = 3/4 * 3/5 * 5/8 = 9/32
Prob of atleast one of them getting right = 1-9/32 = 23/32
B
St1: Say m^2= 8 then m is not an integer and m^3 will also be a non-integer. Say m^2 = 9 then m is an integer and m^3 will be an integer.: INSUFF
St2: if SQRT(m) is an integer then m will always be an integer and m^3 will always be an integer.: SUFF
Q27.
C
Prob of all getting wrong = 3/4 * 3/5 * 5/8 = 9/32
Prob of atleast one of them getting right = 1-9/32 = 23/32
, and i suck at probability questions. 
