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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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- If the 4 letter words formed by using the letters of the word EQUATION...
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- Assertion (A): The number of ways in which 5 boys and 5 girls can sit ...
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- Assertion (A) : The number of ways in which 6 persons can sit around a...
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- sum(r=0)^(n)(P(r))/(r!) is equal to
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- If ""^(n)P(r)=""^(n)P((r+1))and ""^(n)C(r) = ""^(n)C(r-1), then (n,...
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- IF ""^(n) P(r)=720,""^(n)C(r)=120then (n,r)=
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- ""^(2n)C(n+1)+2. ""^(2n)C(n) + ""^(2n) C(n-1) =
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- the value of ""^50C(4) + underset( r=1) overset( 6 ) sum ""^(56...
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- sum( r=0 )^ ( 10) ( 40 -r)C (5)=
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- If ""^(n-1)C(3)+""^(n-1)C(4)gt""^(n)C(3), then
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- If ""^(n)C(4),""^(n)C(5),""^(n)C(6) are in A.P., then the value of n i...
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- If ""^(n)C(r-1)=36,""^(n)C(r)=84 and ""^(n)C(r+1)=126, then r is equal...
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- The value of 2^(n)n!(1.3.5.....(2n-1)) is
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- If a(n)=sum(r=0)^(n)(1)/(""^(n)C(r)) then sum(r=0)^(n)(r)/(""^(n)C(r))...
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- ""^(n)C(r)+4.""^(n)C(r-1)+6.""^(n)C(r-2)+4.""^(n)C(r-3)+""^(n)C(r-4) i...
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- The sum sum(i=0)^(m)((10)/(i))((20)/(m-i)) is maximum when m is
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- In a football championship there were played 153 matches. Every two te...
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- From a group of persons the number of ways of selecting 5 persons is e...
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