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# A fair dice is thrown ten times one after another. What is

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A fair dice is thrown ten times one after another. What is [#permalink]  21 May 2003, 17:37
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A fair dice is thrown ten times one after another. What is the probability of getting an odd number on an even numbered throw and an even number on an odd numbered throw?
Manager
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[#permalink]  22 May 2003, 17:25
i think the problem is worth trying
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[#permalink]  22 May 2003, 22:12
don't quite understand the question? can you explain ?
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[#permalink]  22 May 2003, 22:51
first, third, fifth, seventh & ninth throw.....will give an even number on the dice

second, fourth, sixth, eigth and tenth throw...will give an odd number on the dice
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[#permalink]  23 May 2003, 02:26
Odd throws - five - each throw probability that even turns up is 1/2.
Even throws - five - similar to above probability that odd turns up on each throw is also 1/2

Hence probability that on Every odd throw , we get even = (1/2)^5
And Probability that on Every even throw , we get odd = (1/2)^5

Probability that both these events happen = (1/2)^5 * (1/2)^5

Comments ?
Manager
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[#permalink]  23 May 2003, 02:49
Nothing to comment about.........perfect
[#permalink] 23 May 2003, 02:49
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# A fair dice is thrown ten times one after another. What is

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