engineering recuitment UPCL AE (E&M) 2021 Mock Test Quantitative Aptitude Probability

A bag contains 7 blue, 5 red and 4 black balls. Three balls are selected at random. Find the probability that the balls selected are not of the same color. 

1
\(\frac{63}{80}\)
2
\(\frac{64}{80}\)
3
\(\frac{74}{80}\)
4
\(\frac{73}{80}\)
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