exam Maths Puzzle Numerical Ability

there are 52 cards in a deck:
a.P(3 and black card)
b.P(3 or black card)

Read Solution (Total 0)

exam Other Question

Find the GCF of the product.

(3b+6)(2b-10)

I got 3 for the first parenthesis and 5 for the second but you can only have one answer. What am I forgetting? Pls answer it imeediately because i need the answer as soon as possible, Thanks alot!...Q: A circular patch is to be placed over a 3" hole in a sheet of metal so that the patch extends 3/4" all around. The diameter of the patch will be???