Read the following and answer the questions given below.
1,2,3,4….are natural numbers or counting numbers.
The sum of first 4 numbers is
`1+2+3+4=(1+4)+(2+3)`
`= 5+5`
`= 5xx2`
`=(4+1)+4/2`
We can make pairs as given above and can establish a formula to find the sum of first n natural numbers as sum = `(1+n)xxn/2`
Find the sum of first 10 natural numbers.

Read the following and answer the questions given below. 1,2,3,4….are natural numbers or counting numbers. The sum of first 4 numbers is 1+2+3+4=(1+4)+(2+3) = 5+5 = 5xx2 =(4+1)+4/2 We can make pairs as given above and can establish a formula to find the sum of first n natural numbers as sum = (1+n)xxn/2 Calculate the sum of natural numbers from 10 to 20.

Write the sum of first n natural numbers.

Read the following and answer the questions given below. 1,2,3,4….are natural numbers or counting numbers. The sum of first 4 numbers is 1+2+3+4=(1+4)+(2+3) = 5+5 = 5xx2 =(4+1)+4/2 We can make pairs as given above and can establish a formula to find the sum of first n natural numbers as sum = (1+n)xxn/2 What is the number at the right and of 10^th line 1 2 3 4 5 6 7 8 9 10 .............

Read the following and answer the questions given below. 1,2,3,4….are natural numbers or counting numbers. The sum of first 4 numbers is 1+2+3+4=(1+4)+(2+3) = 5+5 = 5xx2 =(4+1)+4/2 We can make pairs as given above and can establish a formula to find the sum of first n natural numbers as sum = (1+n)xxn/2 In the arrangement of numbers 1,3,6,10,15... 1=1 , 3=1+2 , 6=1+2+3.. What is 10^th number in the arrangement 1,3,6,10,15....

What is the sum of the first 'n' natural numbers?

Which of the following pairs of sets are disjoint {1,2,3,4} and {x:x is a natural number and 4 le x le 6 }

now try to find these sum in your head 1/4+1 3/4+2

Find the sum of natural numbers between 1 and 100 which are divisible by 3.

Let n be an odd natural number greater than 1. Then find the number of zeros at the end of the sum 99^(n)+1

Find the sum of the products of the ten numbers pm 1, pm2, pm 3, pm4 and pm 5 taking two at a time .