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Gate-2018-General-Aptitude-->View question

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Jaynil-GaglaniAkshay-Telmasare

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There are 3 cases in this question:(There are 20 black not red dot balls.)
1. First is black ball. 2. Second is black ball. 3. Both are black balls.
Case 1:
Sample space of case 1 = 25*75
desired outcome of case 1 = 20*75
Case 2 :
It is exactly same as case 1
Case 3:
sample space of case 3 = 25*25
desired outcome of case 3 = 20*20
total sample space = 25*75 + 25*75 + 25*25 = 25*25*(7)
total desired outcome = 20*75 + 20*75 +20*20 = 20*170
probability = 20*170/25*25*7 = 0.777

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