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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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Odd Row 5/10
Odd Column 5/10
Both 1/2*1/2=1/4
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
I think answer is wrong.
can you please check it again?
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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which one do you refer to is wrong ??
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
OA?
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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Added.

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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
1/4
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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I think the answer is not 1/2
lets call i the indice number of rows and j the indice number for columns.
As we are looking at the odd numbers, (i,j) are in [1,3,5,7,9].
Now the probability of getting a zero is the probability of having i>= j.
so the number of possibilities to get i>= j when chosing a couple of numbers is 5+4+3+2+1=15.
(if j=1, you have 5 choices, if j=3, you have 4 choices ...)
The number of possibilities is 5*5=25.
So the probability to get a zero is 15/25 = 3/5
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
@GreenlightTestPrep can you please explain?
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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Farina wrote:
@GreenlightTestPrep can you please explain?


This is a very poorly-worded question.
To be honest, I'm not even sure what it's asking

What is the probability of selecting zeroes from odd rows and odd columns?
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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Re: What is the probability of selecting zeroes from odd rows an [#permalink]
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