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
Farmer counting grasshoppers in his fields, probably not normally distributed due to growing conditions. After various rows the mean number of grasshoppers is 57 SD 12. What will b

The HCF & LCM of two expressions are respectively (x+3) and (x cube-7x+6). If one is x square+2x-3 , other is? Solution) (x+3) * (x^3-7x+6) = (x^2+2x-3) * y      ( ) (HCF*LCM=

1.Verify Liouville''s formula for y "-y" - y'' + y = 0 in (0, 1) ? 2.Find the normalized differential equation which has {x, xex} as its fundamental set. 3.6Find the general soluti

The logarithm of the Poisson mixture likelihood (3.10) can be calculated with the following R code: sum(log(outer(x,lambda,dpois) %*% delta)), where delta and lambda are m-ve


The Central Limit Theorem  The theories was introduced by De Moivre and according to it; if we choose a large number of simple random samples, says from any population and find


I gave my niece a whole heap of beads and showed her how to divide it up into sets of 10 beads each. Then I showed her how she could lay out each set of I0 beads in a line, and cal

how to solve the equation of an inverse function

Which of the following statements do you think are true about children? Indicate with 'T' for true and for false. Give reasons for your choice. a) Most primary school children a