Question
A bag contains 7 (one rupee coins), 4 (two rupee coin)
and 5 (ten rupee coin). Find the probability that 3 coins drawn at random are either (two rupee coins) or (ten rupee coins)?Solution
ATQ, we can say that, Total number of coins are = 7 + 4 + 5 = 16Â Therefore P(E) = n(E)/n(S) Required probability = (Â 4C3 + 5C3Â )/ (16C3Â ) = (4 + 10)/560 = 14/560 = 1/40Â
Average of four numbers is 16. Sum of smallest and largest number is 48. If difference between other two numbers is 2, then find the square of second sm...
Average weight of all the people in a group is 62 kg. When two people of weight 68 kg and 82 kg left the group, average weight reduces by 1 kg. Find the...
- Rohit Sharma has an average score of 80 runs in 150 innings. The highest runs scored by him in an innings exceed his lowest score by 200 runs. If the runs ...
2 years ago, the average age of the family of 3 members is 13 years. A baby is born now; the average age of the family is same as before. Find the age o...
The average number of stickers distributed among five girls is 13. If each girl received 1 sticker more than the girl before, then find the highest numb...
In an examination, the average marks obtained by the students is 80. After correcting the quantitative mistakes, the average of 90 students is reduced t...
Average marks scored by Vineet in five subjects are 85. The average marks scored by him (excluding his highest and lowest marks) are 70 and lowest marks...
In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average ...
In a cricket match the captain of one of a team scored 23 runs more than the average runs scored by the remaining 9 batsmen of that team who batted in t...
Average run scored by a batsman in first ‘x’ matches is 44. In next 8 matches he scored runs with an average of 80 so that his overal...
Relevant for Exams:
