how many 3 digit even numbers are there in which if 7 is one of the digit and next is 9
Answers
Answered by
0
Answer:
If 3digit even numbers start with 5 then next digit is 7.So numbers are 570,572,574,576,578=5 numbers.
Other 3digits numbers can be formed as (1) unit digit can be taken from 0,2,4,6,8 i.e 5 ways.
(2) tenth digit can be taken from 0 to 9 except 5(because if tenth digit is 5 then unit digit is 7 it is not possible).Thus 9 possible cases
(3)Hundredth digit can be taken from 1 to 9 except 5.Thus 8 possible cases.
Hence 8*9*5+5=365 such numbers can be made.
Similar questions