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An unbiased coin is tossed. If the resul...

An unbiased coin is tossed. If the result is head, a pair of unbiased dice is rolled and the number obtained by adding the numbers shown on the two faces is noted. If the result is tail, a card from a well shuffled pack of eleven cards numbered 2, 3, 4, ..., 12 is picked and the number on the card is noted. Find the prbability that noted number is either 7 or 8.

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The correct Answer is:
`(193)/(792)`
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