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If P(n ,4)=20xxP(n ,2),find n....

If `P(n ,4)=20xxP(n ,2),`find n.

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions
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  2. It is required to seat 8 men and 4 women in a row so that the women ...

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  3. If P(n ,4)=20xxP(n ,2),find n.

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  4. If P(n ,4)=18xxP(n ,3), find n

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  5. If P(n ,4)=20xxP(n ,2), then find the value of n

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  6. If P(n ,4)=20 x P(n ,2),find n.

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  7. In how many ways can 6 persons stand in a queue?

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  8. Seven athletes are participating in a race. In how many ways can the ...

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  9. If 22P(r+1):^(20)P(r+2)=11 : 52 ,find r

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  10. If 2n+1P(n-1) : (2n-1)Pn =3:5,find n

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  13. How many 4-letter word, with or without meaning, can be formed out of ...

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  14. If Pm stands for ^m Pm , then prove that: 1+1. P1+2. P2+3. P3++ndotPn=...

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  15. In an examination hall there are four rows of chairs. Each row has 8 c...

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  16. The sum of all four-digit numbers that can be formed by using the d...

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  17. If P(15 ,r-1): P(16 ,r-2)=3:4 , find rdot

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  18. If "^(n+5)P(n+1)=(11(n-1))/2"^(n+3)Pn , find ndot

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  19. How many words, with or without meaning, can be formed by using the ...

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