There are 501 letters and 501 envelopes. Each letter belongs to exactly one of the envelopes. If each letter is put into an empty envelope randomly, then what is the probability that exactly 4 letters go into an incorrect envelope?
'X' is the largest sum of rupees which can never be paid using any number of coins of denominations Rs.4, Rs.8, Rs.13 and Rs.18. What is the sum of the digits of 'X'?
Q21
Q25
What is the maximum power of 3 in the expansion of 1! x 2! x 3! x . . . . x 100!
A test has 50 questions. a student scores 1 mark for correct answer, -1/4 for wrong ans, -1/6 for not attempting a question.How many different net scores are possible?
APPROACH PLEASE
In a triangle ABC, points P1, Q1, R1 divide the lines AB, BC and AC respectively in the ratio 3 : 2 each. In the triangle P1 Q1 R1, the points P2, Q2 and R2 divide the sides P1Q1, Q1R1 and P1R1 in the ratio 3 : 2 each. A new triangle is constructed by joining the points on the sides of triangle P2Q2R2 that divide these sides in the ratio 3 : 2. This process of forming triangles continues infinitely. Find the ratio of the area of triangle P1Q1R1 to the sum of the areas of all the formed/constructed triangles (P2Q2R2, P3Q3R3…) whose areas are smaller than the area of the triangle P1Q1R1.
- 7:25
- 18:7
- 7:18
- 11:25
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The 3rd question, the solution given in the book is confusing me. So , I need a clear answer. Thank you 😃
How to approach ???
A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:
A. Rs. 650 B. Rs. 690
C. Rs. 698 D. Rs. 700
A sum was put up at SI at a certain value for 2 years had it been put up at 3% higher rate it wud have fetched 300 more , find the sum
N! has K trailing zeroes, (N+3)! Has K+4 trailing zeroes, find smallest possible value of N
Sam had forgotten his friend's seven-digit telephone number. He remembers the following: the first three digits are either 635 or 674, the number is odd, and the number nine appears once. If Sam were to use a trial and error process to reach his friend, what is the minimum number of trials he has to make before he can be certain to succeed? (CAT-2000) (1) 10000 (2) 2430 (3) 3402 (4) 3006
In a certain test there are n questions . In this test 2n-i students gave wrong answers to at least i questions where I = 1 , 2, 3 ...n . If the total number of wrong answers is 2047 then n is equal to (CAT) (1) 11 (2) 10 (3) 12 (4) 13
Answer the questions on the basis of the information given below.
Sonal and Deepali started swimming towards each other simultaneously from points A and B respectively situated at two ends of a 96 km long stretch of a river. Destinations of Deepali and Sonal were points A and B respectively. Both of them could swim at 12 kmph in still water. When they started, it was high tide and Sonal swam against the stream. As soon as they met, the tide changed to 'low tide' and then Deepali faced the resistance of the stream. Deepali and Sonal took 7 hr 12 min and 8 hr 48 min to reach their destinations respectively. [Speed of the stream during high and low tide need not necessarily be the same.] "
Find the speed of the stream during low tide.
a)1Km/hr
b)4km/hr
c)2km/hr
d)cannot be determined
guys help me.........there are two books available in market for qa by nishit k sinha......which one to buy???????one with green cover, second edition and other with black cover.......really confused....???
Approach
All three-digit numbers in which the ten's digit is a perfect square are formed by using the digits 1 to 9. The sum of all such numbers is
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friends, plz explain the approach to this problem.
(50*1)+(49*2)+(48*2)+.........(1*50)
a)21050 b)22100 c)23100 d)24200
Yana and Gupta leave points x and y towards y and x respectively simultaneously and travel in the same route. After meeting each other on the way, Yana takes 4 hours to reach her destination, while Gupta takes 9 hours to reach his destination. If the speed of Yana is 48 km/hr, what is the speed of Gupta? 72 kmph 32 mph 20 mph None of these.. Pls post an easy approach
The digit in the unit's place of a number is equal to the digit in ten's place of half of that number and the digit in ten's place of tht number is less than the digit in unit's place of half of the number by 1. If the sum of digits of number is 7, then whts is the no.? Anybody. Thnx. Appreciate it. Ans. 52..? Approach..?