Find the sum of all natural numbers, Mathematics

Find the sum of all natural numbers amongst first one thousand numbers which are neither divisible 2 or by 5

Ans:    Sum of all natural numbers in first 1000 integers which are not divisible by 2 i.e. sum of odd integers.

1 + 3 + 5 + .......... + 999

n = 500

S500 = 500/2 [1 + 999]

= 2,50,000

No's which are divisible by 5

5 + 15 + 25 ........ + 995

n = 100

Sn = 100/2 [5 + 995]

= 50 x 1000 = 50000

∴ Required sum = 250000 - 50,000

= 200000

Posted Date: 4/8/2013 6:06:55 AM | Location : United States

Related Discussions:- Find the sum of all natural numbers, Assignment Help, Ask Question on Find the sum of all natural numbers, Get Answer, Expert's Help, Find the sum of all natural numbers Discussions

Write discussion on Find the sum of all natural numbers
Your posts are moderated
Related Questions
how do you you find 40% if you 35 out of 40

Linda bought 35 yards of fencing at $4.88 a yard. How much did she spend? To multiply decimals, multiply generally, count the number of decimal places in the problem, then us

find the equation of locus of point which lies on bisectors of angles between the coordinate axes

1. A machine comprises of three transformers A, B and C. Such machine may operate if at least 2 transformers are working. The probability of each transformer working is given as di

The distance around a square photograph is 12.8 centimeters. What is the langth of each side of the fotograph?

I am student of and also doing practice to crack bank or other competitive exam..please tell me shortcuts

Q. Find Probabilities for the Standard Normal Distribution? Ans. Suppose the history teacher decides to distribute the final grades of his class with a normal distribution

Example:  Joanne is given a four-question multiple-choice quiz.  She hasnt studied the material to be quizzed, so she decides to answer the questions by randomly guessing the answe

What is the structure of produt promotion?