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Mathematics
The number of positive integers less than 40,000 that can be formed by using all the digits 1, 2, 3, 4 and 5 is equal to
Q. The number of positive integers less than
40
,
000
that can be formed by using all the digits
1
,
2
,
3
,
4
and
5
is equal to
2442
176
KEAM
KEAM 2010
Permutations and Combinations
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A
24
7%
B
78
7%
C
32
6%
D
216
14%
E
72
14%
Solution:
3
□
4
□
3
□
2
□
1
□
(
w
a
ys
t
o
f
i
ll
in
g
t
h
e
b
o
x
)
∴
Required number of positive integer
=
3
×
4
×
3
×
2
×
1
=
72