Question

Section-
Find the sum of first 10 natural numbers.​

Answer 1

Answer:

Natural numbers : 1,2,3........, 10

Now, a=1,d=2-1=1, n=10

Now Sn=n/2+(a+l)

Sn =10/2(1+10)

Sn =5(11)

Sn =55

Answer 2

Step-by-step explanation:

first 10 natural number are 1,2,3..10

so by formula sum of first n positive integer is

n(n+1)/2

=10(10+1)/2

=5(11)

=55