A tray at a Jaipur bangle stall holds 48 bangles in green, red and blue in the ratio 4 : 5 : 7. A customer picks up one bangle at random. What is the probability that it is NOT blue?

Question

Accepted Answer

9/16. The ratio parts add to 4 + 5 + 7 = 16, and 48 / 16 = 3, so there are 12 green, 15 red and 21 blue bangles. Not blue = 12 + 15 = 27, so P = 27/48 = 9/16. 7/16 answers P(blue) instead; 5/16 gives only the red bangles; 3/4 comes from simplifying 27/48 carelessly.

A tray at a Jaipur bangle stall holds 48 bangles in green, red and blue in the ratio 4 : 5 : 7. A customer picks up one bangle at random. What is the probability that it is NOT blue?

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