Find the sum of first 40 positive integers, Mathematics

Find the sum of first 40 positive integers divisible by 6 also find the sum of first 20 positive integers divisible by 5 or 6.

Ans:          No's which are divisible by 6 are

6, 12 ................ 240.

S40   = 40/2 [6 + 240]

= 20 x 246

= 4920

No's div by 5 or 6

30, 60 ............. 600

20/2 [30 + 600]= 10 x 630

= 6300

 

Posted Date: 4/8/2013 5:19:20 AM | Location : United States







Related Discussions:- Find the sum of first 40 positive integers, Assignment Help, Ask Question on Find the sum of first 40 positive integers, Get Answer, Expert's Help, Find the sum of first 40 positive integers Discussions

Write discussion on Find the sum of first 40 positive integers
Your posts are moderated
Related Questions
Determine the ratio in which the line 2x + y -4 = 0 divide the line segment joining the points A (2,-2) and B (3, 7).Also find the coordinates of the point of division. [Ans:2 :

why modi method is used in operation research


List the five most important things you learned about high dimensions.

How can i get a better understanding of logistics without having a degree on logistics and knowledge of it? Simply, in a very basic form..

Need solution For the universal set T = {1, 2, 3, 4, 5} and its subset A ={2, 3} and B ={5, } Find i) A 1 ii) (A 1 ) 1 iii) (B 1 ) 1

Volumes for Solid of Revolution Before deriving the formula for it we must probably first describe just what a solid of revolution is. To find a solid of revolution we start o

Are the two angles of a rectangles congruent ? why ?

Consider x € R. Then the magnitude of x is known as it's absolute value and in general, shown by |x| and is explained as Since the symbol   always shows the nonnegative

find the matrix of the linear transformations T:R2->R2 defined by T(x,y,z)=(x+2y,x-3z).