Drishti IAS Distance Learning Programme
If 5 coins are tossed randomly, what is the chance that one and only one coin will turn up for head?
A box contains 25 cards marked 1 to 25. One card is drawn at random. Find the probability that it is marked with a number multiple of 4 or 7.
How many numbers of four digit can be formed with the digits 0, 1, 3 and 7, if repetition of digits is not allowed?
How many numbers of four digit can be formed with the digits 0, 1, 3 and 7 if repetition of digits is being allowed?
Find the highest power of 4 that completely divides 50!
The HCF of (x2 – 3x – 4) and (9 – x2) is:
If P is any number divided by 23, then the maximum possible difference between the minimum possible and maximum possible remainder can be:
An amount of 620 becames 930 after 9 years at simple interest. If interest rate of last 5 years is 6% than find the interest rate for first 4 years.
Due to a 25% price hike in the price of rice, a person is able to purchase 25 kg less of rice for Rs. 200. Find the initial price of rice.
A is 20% less than B and 20% higher than C. How much percentage is C less than B?
The difference of the perimeter and diameter of a circle is 30 cm then find the area of circle.
Find how many exponents of 7 will be there in 100!
A, B and C can do some work in 18 days. A and B together do twice as much work as C alone does and A and C together can do thrice as much work as B alone. Find the time taken by B to do the whole work.
A man travels from A to B at 15 km/h, travels back from B to A at 20 km/h and again goes back from A to B at 20 km/h. The average speed of the man is:
A dishonest dealer professes to sell at a loss of 5% but uses a 900 gm weight instead of a 1 kg. weight. Find the percent profit/loss to the dealer.