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Multiple choice

There are $7$ red disks and $5$ yellow disks in bag $X$ and there are $5$ red disks and $15$ yellow disks in bag $Y$. If one disk is selected at random from each bag, find the probability that both disks selected are yellow.

  1. $\dfrac {5}{48}$
  2. $\dfrac {7}{48}$
  3. $\dfrac {1}{16}$
  4. $\dfrac {7}{16}$
  5. $\dfrac {3}{4}$
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