Wow, thank you so much for your time and support, very simplified and fast, i understand from this even better than my teachers explanation

I understand the question on the car number, but im still a little confused on Q2) and Q3)

Ok for this one im srry i mistyped 400 but i was meant to write 4000

so heres the question again

How many numbers less than

4000 can be made using the digits

1,2,3,4,5,6,7 which are

even numbers?

LOOK AT THE ORDER OF CHOOSING I WILL DO..
a.. 3 choices for the thousands (need number less than 4 since it must be <4000)

b.. and finally 3 choices for the ones (since its must have have an even digit to be an even number???)

(however, a and b are dependent to each other.. since in a, if 2 were chosen, then there are only 2 choices in b)
5 choices for the hundreds

4 choices for the tens

oh and also the number 4000

so i would have

3x6x5x3+1 permutations in total which is 271 arrangements.

Again thanks for your support on this question, however im still not sure if its right since these questions are tricky, can you check the answer for me if you can thanks alot.