Fill in the blank with the correct number.

A number is divisible by if the sum of its digits is divisibly by three.
A. 2
B. 3
C. 9
D. Both 3 and 9

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15