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In a class there are certain number of s...

In a class there are certain number of students and each student plays a chess game with each other student. If the total number of games played by them is 190. Find the number of students

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20
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-ADDITIONAL EXERCISE
  1. Find the number of ways of selecting cricket eleven from 20 players su...

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  2. Find the number of ways of selecting cricket eleven from 20 players su...

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  3. In a class there are certain number of students and each student plays...

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  4. From the first 20 natural numbers, find the number of ways of selectin...

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  5. Out of 10 persons sitting at a round table, two persons are selected a...

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  6. 10 persons are sitting in a row. Find the number of ways of selecting ...

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  7. Find the number of ways of giving 6 similar coins among 4 boys if ea...

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  8. Find the number of ways of giving 6 similar coins among 4 boys if ea...

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  9. In how many ways a student can fail an examination having 5 subjects.

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  10. In a hall, there are 10 different lamps. In how many ways can the hall...

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  11. In a basket, there are 4 apples, 2 mangoes and 5 bananas. Fruits of sa...

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  12. In a basket, there are 4 apples, 2 mangoes and 5 bananas. Fruits of sa...

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  13. In a basket, there are 4 apples, 2 mangoes and 5 bananas. Fruits of sa...

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  14. Find the number of positive divisors of 1080

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  15. Find the number of proper divisors of 540

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  16. Find the number of even divisors of 720.

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  17. Find the number of even proper divisors of 2^(3)3^(2)5^(3)

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  18. In how many ways 4900 can be expressed as product of 2 positive intege...

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  19. In how many ways 3 different numbers which are in A.P. can be selected...

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  20. Find the maximum number of points into which 4 circles and 4 straight ...

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