In a deck of forty cards, there are ten cards each of red, blue, green, and yellow. What is the probability of selecting two red cards with no replacement? Assume that each card is equally likely to be chosen.

just sum

10 + 10 = 20

6(h+1)/2=a

a=area

step-by-step explanation:

its the same thing as a square or rectangle but after multiplying two sides you need to divide it by two.

do it yourself this is easy

step-by-step explanation:

6 adults and 9 children went.

a + c = 15

12a + 9c = 153

12(6) + 9(9) = 153

72 + 81 = 153