If x bulbs consume x^2 units in x^3 days, then y bulbs will consume y units in how many days?
Triplets x,y and z are chosen from {1,2,3..25} such that z>=y>=x. How many different ways are possible. Answer given is 600.Don't know how.
A circle having diameter 12 cm is cut by a chord of 6 cm, Find the area of smaller arc?
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If Tn+1=2*Tn+3. T1=3,T11=6141, find T2+T3+.....T10
20th and 21st?
What's the difference between 38th and 39th question?
How many 4-digit numbers can be formed by using digits 0 and 5.
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There are 10 students in a class out of which 3 are boys and 7 are girls. In how many different ways can the students be paired such that no pair consists of two boys? #with explanation please.
Que 8
In how many different ways students can be paired such that no pair consists of 2 boys. Given :- Total students = 10, Girls = 7, boys = 3.
A rational number A/B, where A and B are co-prime, is converted into a decimal number. If both A and B are less than 100, then for how many values of B will A/B always be a terminating decimal?
- a 40 b 60 c 14 d 15
| a 40 |
| b 60 |
| c 14 |
| d 15 |
Final question.. How many 'm' digits number can be formed by using 'n' digits. And find the sum of these numbers. (Repetitions not allowed). Thank you guys!
(1)(2,3)(4,5,6)(7,8,9,10)....sum of all term in 40th bracket
Two brothers, each aged between 10 and 90, "combined" their ages by writing them down one after the other to create a four digit number, and discovered this number to be the square of an integer. Nine years later they repeated this process (combining their ages in the same order) and found that the combination was again a square of another integer. What was the sum of their original ages?
How to solve this...?
The ratio of speeds of A and B is 2:3.A takes 25 steps to reach to the bottom of the stationary escalator and B takes 30 steps for the same. A starts ascending whereas B starts descending. At how many steps will B meet A?
A number of six digits is written down at random. Find the probability that sum of digits of the number is even. ( Please mention ur approach). Is it 0.5?
Find the number of positive integral solutions of abc = 45.