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If a denotes the number of permutations ...

If `a` denotes the number of permutations of `(x+2)` things taken all at a time, `b` the number of permutations of `x` things taken `11` at a time and `c` the number of permutations of `x-11` things taken all at a time such that `a=182b c ,` find the value of `xdot`

A

15

B

12

C

10

D

18

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The correct Answer is:
B
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OBJECTIVE RD SHARMA ENGLISH-PERMUTATIONS AND COMBINATIONS-Exercise
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  2. If 7 points out of 12 are in the same straight line, then the number o...

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  3. If a denotes the number of permutations of (x+2) things taken all at a...

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  4. There are number of seats and m number of people have to be seated, th...

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  5. There are 5 letters and 5 directed envelopes. The number of ways in wh...

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  6. Find the number of ways of selecting 10 balls out o fan unlimited n...

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  7. The total number of different combinations of letters which can be mad...

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  8. The total number of six-digit natural numbers that can be made with...

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  9. The number of numbers of 7 digits whose sum of digits is even, is

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  10. All possible four-digit numbers have formed using the digits 0, 1, 2, ...

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  11. If the permutations of a, b, c, d, e taken all together be written dow...

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  12. Determine the number of natural numbers smaller than 10^4, in the deci...

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  13. If eight persons are to address a meeting, then the number of ways in ...

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  14. Find the number of proper factors of the number 38808. also, find sum ...

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  15. All possible products are formed from the numbers 1, 2, 3, 4, ..., 200...

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  16. In an examinations there are three multiple choice questions and each ...

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  17. If all the words formed with the letters of the word 'RANDOM' arranged...

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  18. Find the sum of all the numbers that can be formed with the digits 2, ...

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  19. The sum of the digits in unit place of all the numbers formed with the...

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  20. If the letters of the word MOTHER are written in all possible orders ...

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