Is 5! + 4! = 7! ?

Prove that the points ( 2 , 3, 5) , ( - 4 , 7 , - 7) , ( - 2 , 1 , -10) and ( 4 , - 3 , 2) are the vertices of a rectangle .

Let's find the roots of the equations 5x - (4x - 7) (3x - 5) = 6 - 3(4x - 9) (x - 1)

If the ratio of the sides of a triangle is 4 : 5 : 7, then the triangle must be

Score 1 2 3 4 5 No. of students 3 6 4 7 5 The mode of the distribution is 3.

Find the ratio into which the line segment obtained by joining the points (4, 5) and (7, -1) is divided by the straight line 5x + 4y = 4.

The mean of 1, 3, 4, 5, 7, 4 is m. The numbers 3, 2, 2, 4, 3, 3, p have mean m - 1 and median q. Then p + q equals___

Median of the 7 observations (4, 5, 7, 10, 8, 2, 11) is

In triangle A B C , if r_1=2r_2=3r_3, then a : b is equal to 5/4 (b) 4/5 (c) 7/4 (d) 4/7

The mean deviation of the series 3, 4, 5, 6, 7 about the median is