Alternative Approach: Use alligation rule [120] [0] [100][100] [20]5 : 1 Hence impurity mixed is 1/6 of 12 = 2kg...

Since, the Selling Price is not increased, to keep the profit percentage same the cost price of total mixture needs to be brought back to the origina...

yes 580 is the correct answer . Approach : 1 select 3 numbers in 20C3 ways. cases when none of the selected number is a multiple of 5 : 16C3 ways 20C3...

Boat stationed at C forms a 30-60 - 90 triangle (COA), Hence ratio of sides : AO : OC : AC = 1 : sqrt3 : 2 OC = 300 sqrt 3 Similarly boat stationed at...

As per CAT and other competitive exams

No Answer Key for RC 1. You shall have a discussion of the same in the class itself.

Hence, the number of squares in a 8 x 10 rectangular grid : 10 x 8 + 9 x 7 + 8 x 6 + 7 x 5 + 6 x 4 + 5 x 3 + 4 x 2 + 3 x 1 = 276 squares

Number_of_squares_and_rectangles_in a m x n matrixCase 1 : m = n = k(say)Squares = 1² + 2²+ .. + k² = k(k + 1)(2k + 1)/6Rectangles = 1³+ 2³ + .. + k³ ...

E1+2E2+3E3 = 46+47+48E1+E2+E3 = 81 (consider none fails for maximum value)E2+3E3 = 29+ 27+ 13Solve for E3 to get 9Here E1 = number of students passed ...

26. Let the larger radius be x. By the power of a point theorem,AB BC = FB2x(x-42) = (x-24)26x = 242,x = 96.Now the smaller radius is AC/2 = (AB+BC)/...

Discriminant of a second degree polynomial ax2 + bx + c ( say ) is b2 + 4acnow square of an integer is either of the form 4k or 4k+1 so b2+4ac will ne...

Hi Aarushi , Any digit repeated ( p -1) times is always divisible by p if p is a prime number greater than 5. ( an application of Euler's theorem )...