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Re: A coin is tossed 3 times.
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26 Aug 2022, 07:06
1
Do not evaluate, first what is asked in both quantities Quantity A - Getting 2 heads exactly , that means third one has to be tails There are 3!/2! permutations of the same = So, total 3 different ways of getting 2 heads (HHT/THH/HTH)
Quantity B Getting 1 tails exactly , that means other two have to be heads HHT - There are 3!/2! permutations of the same = So, total 3 different ways of getting 1 tail (HHT/THH/HTH)
Same outcomes in A and B; Quantity A = Quantity B Answer is C