A shopkeeper has 13 washing machines out of which 5 are defective. A customer buys 3 washing machine. What is the probability that exactly one machine is defective?
(a) 1/20 (b) 1/5 (c) 70/143 (d) 35/143
Supriya runs a marathon race in 50 minutes at an average speed of 48 km/hrs . in order to set a national record she needs to win the race in 40 minutes considering that her speed remains constant at what minimum speed should she run to set the record?
Q. In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
2, 3, 5, 7, 11, x, 17