Basic Concepts Of Permutations And Combinations

20 Questions  I  By Sweetsalman123
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 Basic Concepts Of Permutations And Combinations

  
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1.   is evaluated as
A.
B.
C.
D.
2.   is equal to
A.
B.
C.
D.
3.  7! is equal to
A.
B.
C.
D.
4.  0! is a symbol equal to
A.
B.
C.
D.
5.  In nPr ,n is always 
A.
B.
C.
D.
6.  In nPr, the restriction is  Options: A.n > r B. C. D. None of these
A.
B.
C.
D.
7.   In  nPr =n (n-1) (n-2) ........................ (n-r-1), the number of factor is  
A.
B.
C.
D.
8.   nPr can also written as Options: A. B. C. D.None of these
A.
B.
C.
D.
9.  If nP4 = 12 x nP2, then is equal to 
A.
B.
C.
D.
10.  If . nP3: nP2 =3:1, then n is equal to
A.
B.
C.
D.
11.  m+nP2 = 56, m-nP2 = 30 then
A.
B.
C.
D.
12.   If 5Pr= 60, then the value of r is
A.
B.
C.
D.
13.  If n1+n2 P2 = 132, n1-n2P2 = 30 then,  
A.
B.
C.
D.
14.  The number of ways the letters of the word COMPUTER can be rearranged is
A.
B.
C.
D.
15.  The number of arrangements of the letters in the word FAILURE, so that vowels are always! coming together is
A.
B.
C.
D.
16.  10 examination papers are arranged in such a way that the best and worst papers never come together. The number of arrangements is
A.
B.
C.
D.
17.  N articles are arranged in such a way that 2 particular articles never come together. The number of such arrangements is
A.
B.
C.
D.
18.  If 12 school teams are participating in a quiz contest, then the number of ways the first, second and third positions may be won is
A.
B.
C.
D.
19.  The sum of all 4 digit number containing the digits 2, 4, 6, 8, without repetitions is
A.
B.
C.
D.
20.  The number of 4 digit numbers greater than 5000 can be formed out of the digits 3, 4, 5, 6 and 7 (no. digit is repeated). The number of such is
A.
B.
C.
D.
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