Directions (next three questions) : Study the following information to answer the given questions.
A bucket contains 8 red, 3 blue and 5 green marbles.
If 3 marbles are drawn at random, what is the probability that none is red ?
n(S) = 16C3
= 16×15×14/1×2×3 = 560
Out of the three drawn marbles none is red.
Clearly they will be either blue or green.
∴ Required probability = n(E)/n(S) = 56/560 = 1/10
If 2 marbles are drawn at random, what is the probability that both are green ?
If 4 marbles are drawn at random, what is the probability that 2 are red and 2 are blue ?
Samir’s age is one-fourth of his father’s age and two-third of his sister Reema’s age. What is the ratio of the ages of Samir. Reema and their father respectively ?
A alone can make 100 baskets in 6 days and B alone can make 100 baskets in 12 days. In how many days can A and B together make 100 baskets ?
Sarita started a boutique inversing an amount of INR 50,000/- Six months later Neeta joined her with an amount of INR 80,000/-. At the end of one year they earned a profit of INR 18.,000/-. What is Sarita’s share in the profit ?