In a bag, there are 10 black plastic chips, 7 yellow, 5 red, and 3 green.
Total number of chips = 10+ 7 + 5 + 3 = 25
Probability =
Probability ( back drawn) =
Two chips are drawn at random with replacement.. So black is replaced
Probability ( red drawn) =
Probability (black, then red) = *
= =