Thursday

October 2, 2014

October 2, 2014

Posted by **Gloria** on Monday, June 11, 2012 at 9:07am.

- math -
**Pendergast**, Monday, June 11, 2012 at 10:56amsum of first 5 natural numbers = (5)(6)/2

sum of first 21 natural numbers = (21)(22)/2

sum of first 30 natural numbers = 465 = (30)(31)/2

sum of first n natural numbers = (n)(n+1)/2 -- provable by induction

**Answer this Question**

**Related Questions**

Math - 1.(A)(i)Show that 2+4+6+8+..+2n=n(n+1). (ii)Find the sum of the first 200...

SUMS? - what is the sum of the first towo odd numbers? what s the sum of the ...

proof by induction - proof by mathmatical induction that the sum of the first n ...

math URGENT!!!! - i have a list of 5 different numbers. the sum of 2 of the ...

Math 130 - Sum the first two odd numbers, then the first three, the first four...

Math 8th grade - I NEED THESE IN ALGEBRAIC EXPRESSION!! The larger of two sums ...

Math - Sum the first two odd numbers, then the first three, the first four, and ...

Math riddle - nine odd numbers have a sum of 243.find the sum of the first and ...

Math riddle - nine odd numbers have a sum of 243.find the sum of the first and ...

algebra - Are the following true or false? 1. The difference of two natural ...