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30 September, 07:08

12 COINS are tossed and placed in a line. each coin can show either a head or a tail. fine the number of different arrangements which contain 7 heads and 5 tails

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  1. 30 September, 07:31
    0
    35/144

    Explanation:

    7/12*5/12 beacause in case of and we multiply and if there is or in the sentence we add
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