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Out of 10 persons sitting at a round table, two persons are selected at random then the probability that they are not adjacent to each other is

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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-ADDITIONAL EXERCISE
  1. In a class there are certain number of students and each student plays...

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

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

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  4. 10 persons are sitting in a row. Find the number of ways of selecting ...

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

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

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

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

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

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

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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. Find the number of positive divisors of 1080

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  13. Find the number of proper divisors of 540

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  14. Find the number of even divisors of 720.

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

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

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

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

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  19. If a set of 'm' parallel lines intersect another set of 'n' parallel l...

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  20. A question paper is divided into 3 sections A, B and C containing 3, 4...

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