Question
11 people decided to spend an afternoon in two groups. A
group of them decided to go to the theater and the remaining decided to play tennis. In how many ways can the group for tennis be formed? If there must be at least four people in each group? type-sscSolution
Case I- When 4 persons in tennis and rest in the theatre. Number of ways – = 11 C4 × 7 C7 
Case II- When 5 persons in tennis and rest in theatre number of ways= 11 C5 × 6 C6 
Case III-When 6 persons in tennis and rest in theatre= =11C6 × 5 C5 =462 Case IV-When 7 persons in tennis and rest in theatre =11C7 × 4 C4 =330 ways. Total number of ways =2(330+462) =2(792) =1584ways
Select the letter-cluster from among the given options that can replace the question mark (?) in the given series.
DXC, GTH, ?, MLR, PHW
Two inlet pipes 'A' and 'B' can fill an empty tank in 48 minutes and 80 minutes, respectively. Another outlet pipe 'C' can empty the tank in 120 minutes...
A school bag is sold for Rs.360 after giving two successive discounts of 10% and 20%. If school bag is marked up by Rs.280 above its cost price, then fi...
- The ratio between the cost price of a cup and a glass is 8:5 respectively. The cup is sold at a profit of 37.5% and glass is sold at a loss of 20%. If the ...
A number 'X' is 60% less than number 'Y'. A third number 'Z' is (250/3) % of the difference between 'X' and 'Y'. 'Z' is how much percent more than 'X'?
If (442 – 424 + 242) ÷ 13 + √2304 = x, then {(x/2) + 16} = ?
Two pipes, A and B, can independently fill the tank in 24 minutes and 30 minutes respectively, while pipe C can empty 9 gallons from the tank in 3 minut...
A sum of Rs. 840 is divided among X, Y and Z such that X gets Rs. 132 more than Y. Y gets Rs. 75 more than Z. Find the share of Z?
Vinay invested Rs. 9,500 in scheme 'A' at a simple interest rate of 12% per annum and Rs. 8,000 in scheme 'B' at a simple interest rate of 20% per annum...
Currently, the combined age of Rajesh and Ramesh is 77 years. One year ago, the ratio of their ages was 7:8, with Rajesh being 7 parts and Ramesh being ...
Relevant for Exams:
