Question
A 6-digit number is formed using the digits 1, 2, 3, 4, 5
and 6. If each digit can be used only once, then find the probability that the number formed will be divisible by 5.Solution
Total numbers formed = 6! = 720
Since the number is divisible by 5, therefore, at unit place only 5 can come and remaining digits can be arranged in 5! = 120 ways
Total such numbers formed = 120 × 1 = 120
Required probability = 120/720 = 1/6
A and B started a business with investments in the ratio 5:4 respectively. After 4 months, C joined them with an investment 30% more than the investment...
- The cost price and marked price of a pen are in the ratio of 5:8. If the pen is sold with a 10% discount, the shopkeeper makes a profit of Rs. 100. Find th...
X labeled an item with a 60% markup on the cost price and sold it for Rs. 480 after applying a 25% discount. Calculate the percentage profit earned by X...
An article is marked 60% above its cost price. It is sold after successive discounts of 20% and 25% on the marked price. What is the net result?
An article is bought for ₹800 and sold at a profit of 25% . What is the selling price ?
The cost price of an article is Rs. 3500 and a shopkeeper wants to earn 25% profit on it after giving 20% discount on marked price. Find the marked pric...
The cost price of article A and B is Rs. ‘X’ and Rs. (X + 750), respectively. Article A is sold at 20% profit while article B is sold at 10% loss. I...
Pankaj purchased a machine for Rs. 79,000 and spent Rs. 4000 on repair and Rs. 3000 on transport and sold it with 25% profit. At what price did he sell ...
Abhinav bought some pencils for ₹ X. He sold 20% of pencils at 25% loss, one third at 20% profit and the remaining at 25% profit. If the total profit ...
- A shopkeeper earned a profit of 28% on a gadget, while another shopkeeper sold the same gadget for a 20% profit. If the first shopkeeper’s profit was Rs....
Relevant for Exams:
