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Standard VIII
Mathematics
Numbers in General Form
How many 3-di...
Question
How many 3-digit even numbers can be made using the digits 1, 2, 3, 4, 5, 6, 7, if no digits is repeated?
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Solution
From the digits,
1
,
2
,
3
,
4
,
5
,
6
,
7
,
only
3
digits
(
2
,
4
,
6
)
are possible at the unit's place.
Therefore, the unit's place can be filled in
3
different ways.
Ten's place can be filled in
5
ways.
Hundred's places can be filled in
4
ways.
Therefore, number of
3
digit even numbers =
3
×
5
×
4
=
60
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how many 3 digit even numbers can be made using the digits 1 ,2, 3, 4 ,6 ,7 of no digit is repeated?
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