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Robin draws a tile from a bag that contains 4 white tiles, 5 green tiles and 9 yellow tiles. She then draws a second tile without replacing the first. What is the probability that both tiles Robin draws are white?

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Answer:

2/51

Step-by-step explanation:

there are 4 white tiles and 18 total tiles in the bag, so your ratio is 4 out of 18 and 2/9 when simplified. When Robin draws out the first one, if it is white, then because he keep that one out, there are only 3 white tiles left and 17 total tiles left, so 3/17 is his chance of drawing a white the second time. you multiply 2/9 and 3/17 together because there is a chance for him to draw the white tile the first time and a chance to draw a white again the second time, so it is reasonable for the chance to be really small. 2/9 x 3/17=2/51.