210 ÷ 7 × 5 – 10 + 15 30 × 5 – 10 + 15 150 – 10 + 15 = 155
The probability of selecting a rotten apple randomly from a heap of 600 apples is 0.14. What is the number of rotten apples in the heap?
A coin is tossed successively three times. Find the probability of getting exactly one tail or two tails?
The probability of selecting a rotten apple randomly from a heap of 900 apples is 0.18. What is the number of rotten apples in the heap?
...A bag contains 10 white and some black balls. If the probability of drawing a black ball from the bag is 2 times that of drawing a white ball, find the ...
If the letters of the word HORIZON be arranged at random, what is the probability that vowels are not together?
Roger Federer play 3 sets of a tennis match. The probability of his winning the three sets are 1/9,1/4,3/4 respectively. What is the probability that he...
A bag contains 18 black and 20 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
There are (m + 6) red roses, (m + 12) white roses and ‘m’ pink roses in a bag. If the probability of picking a pink rose is 4/15, then find the valu...
A word consists of 9 letters 5 consonants and 4 vowels. Three letters are chosen at random. What is the probability that more than one vowel will be sel...
If three socks are chosen at random, what is the probability that all are blue socks?
