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In a group of boys and girls, a team consisting of four children is formed such that the team has atleast one boy. The number of ways of forming a team like this is
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Important Questions on Permutation and Combination
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Five points are marked on a circle. The number of distinct polygons of three or more sides can be drawn using some (or all) of the five points as vertices is
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The sum of all proper divisor of is
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If is a set with elements and then the number of elements in is
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If and , then the value of is equal to
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The total number of digit numbers in which the digits are in ascending order is
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In a group of girls, two are sisters. In how many ways can they sit if the sisters do not sit with each other
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The number of digit telephone numbers having atleast one of their digits repeated is
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If then is equal to
