Question
A bag contains 5 pink balls, 10 grey balls, and 3 brown
balls. Two balls are drawn at random. Find the probability that the two balls are grey.Solution
Number of ways of selecting two grey balls = 10 C₂
Total number of balls = 5 + 10 + 3 = 18
Number of ways of selecting two balls = 18C₂
Probability = 10 C₂ ÷ 18 C₂ = (10 × 9) ÷ (18 × 17) = 90 ÷ 306 = 5/17
More Arithmetic Problem Questions
(30 × 0.80)⁴ ÷ (2160 ÷ 60)⁴ × (54 × 16)⁴ = (6 × 4)?+5
3/7 of 504 ÷ 12 + 17 = √?
20% of 150 + 30 X 4 = ? X 5
52% of 400 + √(?) = 60% of 600 - 25% of 400
135÷ 15 x 19 + 14807 = ? + √3249 - √9604
(22² × 8²) ÷ (92.4 ÷ 4.2) =? × 32
15 * 12 + 35% of 80 + 70% of 130 = ?
60 % of 640 - 57 × 2 - 1520 / 38 = ?
- Find the simplified value of the given expression:
10 of 5 ÷ 4 × 2² + √25 – 8 (168 ÷ 12 + 19 × 64)/(22+1) = ?
