AIEEE Exam Category

A die is thrown again and again until three sixes are obtained. Find the probability of obtaining the third six in the sixth throw of the die

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events=6, occurence=1 therefore=1/6
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AIEEE Other Question

Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4.Then the number of spectral lines in the emission spectra will be :
(1) 2
(2) 3
(3) 5
(4) 6 On a multiple choice examination with three possible answers(out of which only one is correct) for each of the five questions, what is the probability that a candidate would get four or more correct answers just by guessing ?