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Math 11 Chapter 7
Permutation, Combination and Probability
Test - 8
1.
For a positive integer n n! = ________
a) n. 5. 2. 1
b) n
2
c) n (n-1) (n-2)……3.2.1
d) n.n (n-1)…2.1
2.
0! = ……………
a) 0
b) 1
c) None
d) undefined
3.
n
P
r
in factorial form is……
a) n! –r / n!
b) n! / r! (n-r)!
c) n!r / (n-n)!
d) n!
4.
n
P
o
=………….
a) 0
b) 1
c) 0
d) n!
5.
n
P
r
= ………..
a) n(n-1)……(n-r)
b) None
c) n (n-1)……(n-r-1)
d) n(n-1) (n-2)….. (n-r+1)
6.
n
P
1
= _________
a) 1 / n!
b) n! / (n – r )!
c) n!
d) n
7.
20
P
3
= ________________
a) 20x19x18
b) 3 / 20!
c) 20! / 3!
d) 20x3
8.
n
P
n-1
=____________
a) (n-1)!
b) n!
c) n (n-1)
d) 1
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