Question
A box contains Z black balls and
7 white balls. If two balls are drawn at random, one after another without replacement, and the probability of drawing both black balls is 5/11 , find the value of Z.Solution
ATQ, 
Using the optional method: 
More Probability Questions
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
?2 = √20.25 × 10 + √16 + 32
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
42 * 7 * 64 * 11 * 6 *4
276 ÷ 11.5 + 12 = ? x 3
? = 20% of 1200 + 256
?2 + 114 - 48 ÷ 2 × 5 = 163
Find the simplified value of the given expression:
7 of 9 ÷ 3 × 5² + √81 – 1448% of ? = 10176
35% of 500 × 22% of ? = 847
5(? + 2)Â =Â 3125Â
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