Question
In how many ways can the selection of 4 boys and 3 girls
can be made from a group of 6 boys and 6 girls?Solution
Selection of 4 boys from 6 boys = 6C4 = 6!/(4! ×2!) = 15 Selection of 3 girls from 6 girls = 6C3 = 6!/(3! ×3!) = 5 Required number of ways = 15 × 5 = 75
Gaurav ate in a restaurant and got a membership discount of 30% on the original bill amount but he has to pay 9% as service tax and 8% service charge on...
The mean of three distinct numbers is 30. If the third number is to the combined total of the first two numbers in the ratio 16:29, what is the sum of t...
- When a number is divided by 31, the remainder is 28. Find the remainder when twice the number is divided by 31.
The sum of the exponents of the prime factors in the prime factorization of 108 is
Sum of squares of three consecutive numbers is 1325. Find the sum of first and third number.
How many digits are required to write first 500 natural numbers?
The largest three-digit number which gives the same remainder 3 when divided by 4, 9, 6 is:
- A two-digit number '9f' is completely divisible by '4'. When the same number is divided by '3', there is a remainder of '2'. Find the value of 'f'.
If the 4-digit number r76s is exactly divisible by 9, what is the least value of (r + s)?
The difference between the value of the number increased by 20% and the value of the number decreased by 30% is 120. Find the number.
