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Permutations an...

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  • Question 1
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  • Question 2
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    A library has a'a' copies of one book, b'b' copies of each of two books, c'c' copies of each of three books, and single copy each of d'd'. The total number of ways in which these books can be arranged in a row is

  • Question 3
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    Total number of ways of selecting two numbers from the set 1,2,3,...90{1,2,3,...90} so that their sum is divisible by 33 is

  • Question 4
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    In a certain examination paper, there are nn question. For j=1,2....nj = 1, 2....n, there are 2nj2^{n-j} students who answered jj or more questions wrongly. If the total number of wrong answers is 40954095, then the value of nn is:

  • Question 5
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    The number of nn digit numbers which consists of the digits 11 & 22 only if each digits is to be used atleast once, is equal to 510510  then nn is equal to

  • Question 6
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    Fill in the missing values.

    JVRB
    Z18242214
    L1117157
    ?915135
    T1521?11

  • Question 7
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    Find the missing number, if same rule is followed in all the three figures.

  • Question 8
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    The value of r=010(r)\displaystyle\sum^{10}_{r=0}(r) 20Cr^{20}C_r is equal to?

  • Question 9
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    Find the missing number in the given figure?

  • Question 10
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    A student is to answer 10 out of 13 questions in an examination such that he must choose at least 4 from the first five questions. The number of choices available to him is 

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