Question
A bowl contains 9 blue balls, 7 white, and 5 black
balls. If 2 balls are drawn in one go, then the probability of exactly one ball being white is:Solution
In total, we have 9+7+5=21 balls. We have drawn 2 balls; we can draw them in 21C2 ways = 21! ÷ (19! ×2!) = 210 ways. In those two balls, we need one to be a white ball, so we can include that in 7C1 ways = 7 ways. The remaining ball may be any color ball but not white, so we select other balls in 14C1 ways= 14 ways. Probability= (7×14)/210 =7/15.
(22 + √3364)/(? + 4) = 10
What value should come in place of (?) question mark.
[36% of 250 + (3/5 of 320) − 18] ÷ 6 = ?
What value should come in the place of (?) in the following questions?
(√1225 × 14) ÷ 5 + 95 × 55 = ?
(25.111 % of 200) × 26 ÷ 12.99 – 18.88 × 15.82 + 150.33% of 3√ 4917 = ? – 200
...2*1/3 + 22*1/3 + 222*1/3 + 2222*1/2 + 22222*1/2 = ?
What will come in the place of question mark (?) in the given expression?
? X √36 - 184 = 62 X 4
- What will come in place of (?) in the given expression.
48 ÷ 4 × 5 + 36 – 18 = ? 26 X √25 + 15 - 80% of 120 = ?2
Simplify the following expressions and choose the correct option.
(7/9) of [81 − {36 ÷ (4 + 2)}] = ?
Simplify the following questions and choose the correct option.
25% of 480 + 35% of 200 + (18² ÷ 9) = ?
Relevant for Exams:
