Question

A die is thrown twice, what is the probability that.

(i) Getting the sum on both the dice is 9.

(ii) Both the dice have no same number.​

Answer 1

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• Total number of ways = 6×6 = 36

$\mathbf{\underline{answer \: 1}}$

• sum of number is 9
• possible results = [ (5,4) (4,5) (6,3) 3,6) ]
• number of results = 4
• probability = 4/36 = 1/9

$\mathbf{\underline{answer \:2 }}$

• both pf the same digit
• possible results = [ (1,1) (2,2) (3,3) (4,4) (5,5) (6,6) ]
• number of results = 6
• probability = 6/36 = 1/6

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