cards, and balls in bags questions

1. elvalute 3(5 choose 2)+3!

2. five red cards are number 1 to 5 and seven blue cards are numbered 1 to 7

(a)in how many diffrent ways can be 2 cards be selected

(b) in how many ways can 2 cards be seclected if only red cards are picked

two cards picked at random

(c) what is the posibility both cards are red

what is the probility both are number 5

3. a bag contains eight balls number 1 to 8 3 balls are picked and placed in a row

(a)how many 3 digit numbers can be formed

(b) how many numbers are odd and lie between 200 and 300

(c)what is the porbabitlity that the number is less then 300

(D)that the number formed in all even.