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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS -EXERCISE 7 (a) Short Answer Type Questions
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Play - (i) Compute 2!+3!. Is 2!+3!=5! ? (ii) Compute (8!)/(4!). Is (8!)...
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Play - Evaluate (n - r) !, when : (i) n=6, r=2 (ii) n=9, r=5
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Play - Evaluate (n!)/((n-r)!) when : (i) n=10,r=4 (ii) r = 1 (...
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Play - Find the L.C.M. of 3!, 4! And 5!.
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Play - (i) If (1)/(9!)+(1)/(10!)=(n)/(11!), find n. (ii) If (1)/(8!)+...
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Play - Prove that: n !(n+2)=n !+(n+1)!
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Play - (i) If (n+1)!=12[(n-1)!], find n (ii) If (n+2)!=60[(n-1)!], find ...
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Play - If (n !)/(2!(n-2!))a n d(n !)/(4!(n-4!)) are in the ratio 2:1 , find t...
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