Math, asked by mehakjbaid, 9 months ago

how many 3 digit even numbers are there in which if 7 is one of the digit and next is 9​

Answers

Answered by nandanavenu2004
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.

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