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On a new year day every student of a cla...

On a new year day every student of a class sends a card to every other student. The postman delivers 600 cards. The number of students in the class are

A

42

B

34

C

25

D

52

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The correct Answer is:
C
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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  8. The number of arrangements that can be formed out of GANESHPURI so tha...

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  10. The letters of the word “HOSTEL' are arranged so that vowels occupy th...

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  12. The number of ways of arranging 6 players to throw the cricket b...

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  13. The number of ways in which 5 boys and 5 girls can be arranged in a ro...

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  14. The number of ways in which 5 boys and 5 girls can be arranged in a ro...

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  15. A : the number of ways in which 5 boys and 5 girls can sit in a r...

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  16. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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  17. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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  19. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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