Question

in the box A there are 3 spheres and 7 cubes, in the box B there are 4 spheres and 5 cubes. After picking one element from box A and putting in the box B, what is the probability of picking a sphere from the box B ?

Answer 1

help.......

Answer 2

43/100

Answer 3

the answer?

Answer 4

s

Answer 5

how do I start the problem?

Answer 6

my textbook says 57/100

Answer 7

3/10*5/10+7/10*4/10

Answer 8

7/10 and 4/10 represent what?

Answer 9

7/10 taking a cube from A ---4/10 now selecting a sphere from B

Answer 10

oh, right