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The number of values of r satisfying the...

The number of values of r satisfying the equation
` ""^(39)C_(3r-1) -""^(39)C_(r^2) = ""^(39)C_(r^2-1) -""^(39)C_(3r)` is

A

1

B

2

C

3

D

4

Text Solution

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The correct Answer is:
B
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DISHA PUBLICATION-PERMUTATIONS AND COMBINATIONS-PRACTICE EXERCISES ( FOUNDATION LEVEL)
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  4. The total number of all proper factors of 75600 is

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  7. In how many ways can twelve girls be arranged in a row if two particul...

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  10. If a secretary and a joint secretary are to be selected from a committ...

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  11. On a railway route there are 20 stations. What is the number of differ...

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  12. If P(32, 6) = kC (32, 6), then what is the value of k?

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  13. How many times does the digit 3 appear while writing the integers from...

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  16. How many straight lines can be formed from 8 non-collinear points on t...

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  17. A man has 3 shirts, 4 trousers and 6 ties. What are the number of ways...

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  18. If (""^(28)C(2r): ""^(24)C(2r-4))=225:11 .Find the value of r.

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  19. There is a question paper consisting of 15 questions. Each question ha...

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  20. How many numbers can be formed with the digits 1, 6, 7, 8, 6, 1 so tha...

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