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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
- ""^(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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- In a chess tournament where the participants were to play one game wit...
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- A teacher takes 3 children from her class to the zoo at a time as ofte...
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- From 0 to 9, four digited numbers can be formed such that the digits a...
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- The total number of 4 digit numbers in which the digits are in descend...
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- There are 12 balls numbered from 1 to 12. The number of ways in which ...
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- The number of ways in which we can select four numbers from 1 to 30 so...
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- The number of ways in which 4 vowels and 2 consonants be chosen from E...
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- The number of ways in which 5 players be chosen from 12 players so as ...
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