20 biscuits in a tin, 12 plain, 5 chocolate, 3 currant. Probability that 2 biscuits are not the same
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Answer:
111/190
Step-by-step explanation:
Hey,
The probability would be:
The total number of biscuits = 20
(plain, plain) = (12/20)(11/19) = 132/380
(chocolate,chocolate) = (5/20)(4/19) = 20/380
(ginger,ginger) = (3/20)(2/19) = 6/380
Probability (they both are of the same type) = 132/380+ 20/380 + 6/380 = 158/380 = 79/190
Probability (they were not the same type.) = 1- 79/190 = 111/190
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