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Math 11 Chapter 7
Permutation, Combination and Probability
Test - 1
1.
Value of 0! is?
a) -1
b) zero
c) 2
d) 1
2.
n! = n(n-1).(n-2)!
a) n(n-1).(n+2)!
b) n(n-2).(n-2)!
c) n(n+1).(n-2)!
d) n(n-1).(n-2)!
3.
n(n-1) (n-2) = n!/(n-2)!
a) False
b) True
4.
Permutation of n different objects is a subset of given objects.
a) False
b) True
5.
No of permutations of n different objects taken r at a time is
a) n/(n-r)!
b) n!/(n-r)
c) n!/(n-r)!
d) n!/(n+r)!
6.
Number of signals that can be given by 5 flags of different colours using 3 flags at a time is 120.
a) False
b) True
7.
Five boys and four girls can be seated on a bench so that the boys and the girls can occupy alternate seats in 20.
a) False
b) True
8.
Four persons can be seated on a round table in?
a) 6 ways
b) 8 ways
c) 3 ways
d) 4 ways
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