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There are 20 boys and 10 girls in a grou...

There are 20 boys and 10 girls in a group. In how many ways can a group leader be selected in the group leader can either be a boy or a girl.

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MOTION-PERMUTATION AND COMBINATION -EXAMPLE
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  2. There are 20 boys and 10 girls in a group. In how many ways can a grou...

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  3. Prove that sum(k = 1)^(n) k. ""^(k)P(n + 1) -1.

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  4. In how many ways can we arrange 6 different flowers in a circle ? In h...

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  6. In how many ways the letters of the word “ARRANGE” can be arranged wit...

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  7. A delegation of four students is to be selected from a total of 12 stu...

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  8. If ""^(49)C(3r - 2) = ""^(49)C(2r + 1), find 'r'.

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  9. A regular polygon has 20 sides. How many triangles can be drawn by usi...

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  10. 10 persons are sitting in a row. In how many ways we can select three ...

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  11. In how many ways we can select 4 letters from the letters of the word ...

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  12. There are 10 different books in a shelf. In how many ways we can selec...

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  13. There are 12 fruits in a basket of which 5 are apples, 4 mangoes and 3...

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  14. Find the number of solutions of the equation x + y + z = 6, where x, y...

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  15. In a bakery four types of biscuits are available. In how many ways a p...

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  16. Find the number of divisors of 57600. Also find the sum of all divisor...

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  17. In how many ways 8100 can be resolved into product of two factors ?

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  18. How many 3 digit numbers can be formed by using the digits 0, 1, 2, 3,...

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  19. How many functions can be defined from a set A containing 5 elements t...

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