CBSE 10th (Tenth) Maths SA2 Solved Question Paper 2017 Probability
175 views · Published 6 April 2017 · 2:57 · Indexed 17 October 2026
Channel: Dilip Thakur · 2017 · People & Blogs
A bag contains 15 white and some black balls. The probability of drawing a black ball from the bag is thrice that of drawing a white ball. Find the number of black balls in the bag Solution Let the number of black balls is x Total number of balls= 15+x Probability of black balls P(B)=x/15+x Probability of black balls P(W)=15/15+x As per the conditions given P(B)=3P(W) x/15+x = 3*15/15+x x=45
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