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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
- How many automobile licence plates can be made if the inscription on e...
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- The Licence plates for vehicles registered in Delhi consist of 3 lette...
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- Evaluate : "^8P5.
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- Evaluate : "^10P3.
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- Evaluate : "^20P4.
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- Evaluate : "^75P2.
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- Find r if : ^5Pr= "^6P(r-1).
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- Find r if : "^10Pr= 2^9Pr.
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- Find the value of r if 5. ^4Pr= 6. "^5P(r-1).
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- Find r if "^5Pr =2 "^6P(r-1).
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- Find r if : P(11,r) = P(12,r-1)
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- Find r if : ^10P(r+1): "^11 P(r)= 30:11.
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- Find n if : "^(2n)P3=100 ^nP2.
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- Find n if : 30 ^nP6= "^(n+2)P7.
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- Find n if : 2^5P3= "^nP4.
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- Find n if "^(n-1)P3 : "^nP4 =1:9.
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- Prove that : "^nPn= 2^nP(n-2).
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- Prove that : ^10P3= "^9P3+3^9P2.
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- Show that ^nPn= "^nP(n-1) for all natural numbers n .
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- How many 3-digit numbers can be formed by using the digits 1 to 9 if n...
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