Question

Reena has 4 member with her all are even number and one them is single digit number .the others are all ending in 4​

Answer 1

Answer:

4500

Step-by-step explanation:

Hi,

FIRST, lets write down the restrictions

1) these are four digit even numbers, so first digit can be 1 to 9, and the units digit can be 2,4,6,8, or 0..

2) any number of repetition can be done..

Now, lets work out a solution on these restrictions

1) units digit= any of five even digits.. 0,2,4,6,8..

2) at tens and hundreds position any of the ten digits can be placed ..

3) at thousands place, any of the 10 except 0 can be placed...

the ways= 5*10*10*9= 4500

another way

1) what are the different ways without any restriction =10*10*10*10=10,000..

2) out of these ways in which first digit is 0...= 1*10*10*10=1000..

3) Remaining= 10000-1000=9000

4) Half of 9000 will be even and other half odd.. so even = 9000/2=4500..

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