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  4. Six fair coins are tossed simultaneously. Number of ways in which atmost three of the coins turn up as heads in a definite order, is

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Q. Six fair coins are tossed simultaneously. Number of ways in which atmost three of the coins turn up as heads in a definite order, is

Permutations and Combinations

Solution:

${ }^6 C _0+{ }^6 C _1+{ }^6 C _2+{ }^6 C _3=42$