In a certain class, there are four students in the first row: three girls
(Ann, Barbara, and Cathy), and one boy (David). The teacher will call on one of these students to solve a problem at the board. When the problem is completed, the teacher will call on one of the remaining students in the first row to do a second problem at the board.
1)what is the probability that david will be one if only one student is called?
2)What is the probability that David will be one of the two students called?
How many pair of numbers are possible such that their LCM is 2^7 x 5^5 and the HCF is 2^3 x 5^2?
20
12
7
2
1
is there any trick or method to solve quickly questions like : What number to add/subtract in X to make it perfect cube/square? Thanks
1 and 8 are the first two natural numbers for which 1+2+3+........+n is a perfect square.find the 4th such number?
The sum of all interior angles of eight polygons is 3240°. What is the total number of sides of polygons?
How many triples of natural numbers (a, b, c) such that a, b and c are in geometric
progression, and a + b + c = 111.
In how many ways 3 letters can be selected from 3 identical A's, 3 identical B's and 3 identical C's?
Hey guys. I have a lot of study material from last year lying with me. TIME material, TCC material and Arun Sharma. Lots of test papers and everything we received from the institute. I am willing to sell everything away for Rs.1200. Anyone who is interested [In Delhi only] , please get in touch with me at [email protected]
A and B start running from two opposite ends of a 1000m racing track. A and B travel
with a speed of 8m/s and 5m/s respectively. How many times they meet, while running, in
first 1000s after start?
try this :::if two square are chosen from a standard chess borad,find the probability that they have common vertex?
try this::how many triplets from 1st 20 natuaral nos. such that their sumis divisible by 3?
http://s1.postimg.org/ld0hitmfz/screenshot_1.png
Explanation of this too. using wrong logic i got correct answer 😁
1 + sinx +sin^2 x +sin^3 x +........infinite=(4+rt3) then find x=?
cos (2x/7) +cos(4x/7) + cos(6x/7)=?
try this:: a point is selected randomly inside a semicircle.the probability that the distance of the point from the centre of the circle is atleast 25% of the distance from the nearest point on the circumference of the smicircle??
Given that 34! = 295 232 799 cd9 604 140 847 618 609 643 5ab 000 000,
determine the values of a, b, c, d
70% of the students who joined XLRI last year play footbal, 75% play cricket, 80% play basketball, 85% percent play carrom, the minimum percentage of students who play all the 4 games is ?