Question
A team of 6 members is to be formed from a group of 7
boys and 6 girls. Find the number of ways to form team such that the team consists of at most 3 girls.Solution
Required number of ways = 6C3 Γ 7C3 + 6C2 Γ 7C4 + 6C1 Γ 7C5 + 7C6
= 20 Γ 35 + 15 Γ 35 + 6 Γ 21 + 7
= 700 + 525 + 126 + 7 = 1358
Anchal allocates 20% of his monthly salary to transportation, dedicates 50% to shopping, and invests 20% of the remaining balance in food expenses. The ...
Person P allocated 35% of his salary to his son for school fees. From the remaining amount, he saved 40% in his bank account. The...
40% of βsβ along with 60% of βtβ makes a total of 200. If βtβ is 70 more than βsβ, then calculate (2s β t).
...The respective ratio of monthly income of A to monthly income of B is 13:14, and Aβs saving is (100/21)% more than Bβs saving. Find the expenditure ...
The boys and girls in a college are in the ratio 3:2. If 15% of the boys and 25% of the girls are adults, then adults are approximately how much % less ...
- Out of a city's population, 30% are not eligible to vote. Of those who are eligible, 50% are females. If 2/5 of the eligible males and 3/10 of the eligible...
What is the percentage change in the result when we add 36 to a certain number x, instead of subtracting 36 from the same number x?
In a colony, there are 100 APL families and 50 BPL families. Each APL and BPL family got blankets equal to 20% and 68%, respectively of total number of ...
The length of a rectangle is increased by 20% and the breadth is decreased by 10%. What is the percentage change in the area of the rectangle?
There are 500 students in a college. 45% of them are boys. Among the boys and girls, 35% and 50% respectively are interested in music. How many students...