Question

An urn contains 2 red balls and 4 blue balls. (a) If 3 balls are selected all at once, what is the probability that 2 are blue and 1 is red? (b) If 3 balls are selected by pulling out a ball, noting its color, and putting it back in the urn before the next section, what is the probability that only the first and third balls drawn are blue? (c) If 3 balls are selected one at a time without putting them back in the urn, what is the probability that only the first and third balls are blue? (a) The probability that 2 balls are blue and 1 is red is . (Type an integer or a simplified fraction.) (b) The probability is . (Type an integer or a simplified fraction.) (c) The probability is . (Type an integer or a simplified fraction.)

          An urn contains 2 red balls and 4 blue balls.
(a) If 3 balls are selected all at once, what is the probability that 2 are blue and 1 is red?
(b) If 3 balls are selected by pulling out a ball, noting its color, and putting it back in the urn before the next section, what is the probability that only the first and third balls drawn are blue?
(c) If 3 balls are selected one at a time without putting them back in the urn, what is the probability that only the first and third balls are blue?

(a) The probability that 2 balls are blue and 1 is red is .
(Type an integer or a simplified fraction.)

(b) The probability is .
(Type an integer or a simplified fraction.)

(c) The probability is .
(Type an integer or a simplified fraction.)

$An urn contains 2 red balls and 4 blue balls. (a) If 3 balls are selected all at once, what is the probability that 2 are blue and 1 is red? (b) If 3 balls are selected by pulling out a ball, noting its color, and putting it back in the urn before the next section, what is the probability that only the first and third balls drawn are blue? (c) If 3 balls are selected one at a time without putting them back in the urn, what is the probability that only the first and third balls are blue? (a) The probability that 2 balls are blue and 1 is red is . (Type an integer or a simplified fraction.) (b) The probability is . (Type an integer or a simplified fraction.) (c) The probability is . (Type an integer or a simplified fraction.)$

Added by James C.

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