Book Maths Puzzle Numerical Ability

you have all the numbers card,pick 2 cards, what is the probability that they have different colors but same number?

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Book Other Question

how many terms will (a+b+c)^2 have?
a. 22C2
b. 20C2
c. 19C2
d. 18C2
if all possible 4 digits numbers are formed using the digits 5,6,7,8 without repetition and arranged in ascending order of magnitude then the position of the number 7685.
a) 16
b) 17
c) 18
d) 15