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 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.

What is the sum of the 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 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....

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 natural numbers between 1 and 100 which are divisible by 3.

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

Find the sum of first 24 terms of the list of numbers whose nth term is given by a_n =3+2n.

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 }