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IF ""^nP6=42 ""^nP5 then n=...

IF ` ""^nP_6=42 ""^nP_5` then n=

A

45

B

`40

C

`47`

D

`12`

Text Solution

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1A (PERMUTATIONS )
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  2. The remainder when x=1! +2! +3! +4! +. . . +100! is divided ...

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  3. IF ""^nP6=42 ""^nP5 then n=

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  4. IF ""^((n+1))P(7)= 72 ""^nP5 then n=

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  5. IF ""^((2n-1))P(n-1) : ""^((2n-1))Pn = 3:5 then n=

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  6. IF ""^(n+5)P(n-1) = (11 (n-1))/(2)""^(n+3)Pnthen the value of n is

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  7. IF ""^(10)p r = 5040 then r=

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  8. IF ""^(15)P(r-1):""^(16)P(r-2) = 3 : 4 then r=

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  9. IF ""^(20)P(r):""^(20)P(r-1)=15 :1 then r=

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  10. IF ""^(12)P(r )=""^(11)P(6)+6^(11)P5, then r=

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  11. ""^(15)P(8)=A+8.""^(14)P(7 )implies A=

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  12. IF ""^((m+n))P(2) =90 ,""^((m-n))P(2) =30 then (m,n)=

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