Three cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. find the probability of drawing three cards of the same suit.

There are 4 suit ,, hearts , Diamonds , clubs , Spades 

then the 3 cards may be from the 1st OR 2nd OR 3rd OR 4th 

p(A)=4*(13C3)/(52C3)=0.0517 Or 5.17% 

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Cthe residual plot for model 1 has a non random pattern and is a good fit for the data