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M = {-6, -5, -4, -3, -2} T = {-2, -1, 0, 1, 2, 3} If an

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M = {-6, -5, -4, -3, -2} T = {-2, -1, 0, 1, 2, 3} If an [#permalink]

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New post 06 Jun 2009, 03:11
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M = {-6, -5, -4, -3, -2}
T = {-2, -1, 0, 1, 2, 3}
If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?

A. 0
B. 1/3
C. 2/5
D. 1/2
E. 3/5
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Re: PS [#permalink]

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New post 07 Jun 2009, 02:41
tenaman10 wrote:
M = {-6, -5, -4, -3, -2}
T = {-2, -1, 0, 1, 2, 3}
If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?

A. 0
B. 1/3
C. 2/5
D. 1/2
E. 3/5


D

Keep in mind that you cannot select "-2, -1, 0" from T, b/c M contains all negative so products will be positive or zero.
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Re: PS [#permalink]

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New post 07 Jun 2009, 04:20
M = {-6, -5, -4, -3, -2}
T = {-2, -1, 0, 1, 2, 3}

Total no. of cases = 5*6 = 30
No. of cases when product is -ve possible for M= {-6, -5, -4, -3, -2}, and T= {1, 2, 3}= 5 * 3 = 15

Probability = 15/30 = 1/2
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Re: PS [#permalink]

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New post 08 Jun 2009, 09:13
possibility of selecting a negative number from M is 1
possibility of selecting a negative number from T is 3/6
=> 1*3/6=1/2
D

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Re: PS   [#permalink] 08 Jun 2009, 09:13
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M = {-6, -5, -4, -3, -2} T = {-2, -1, 0, 1, 2, 3} If an

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