Question

Writ the first 11 odd number and find it sum without actual

Answer 1

Answer:

11 odd number are 1 ,3 ,5 ,7 ,9 ,11 ,13 ,15 ,17 ,19 , 21

Step-by-step explanation:

1+3+5+7+9+11+13+15+17+19+21 = 121

Answer 2

Step-by-step explanation:

First 11 odd numbers are 1,3,5,7,9,11,13,15,17,19,21

and sum of first 11 odd numbers is

Method :-1

By adding 1+3+5+...........+21= 121

or

By sum of a.p

n/2(a+l)=11/2(1+21)

=11/2(22)

=11×11=121

or

formula for odd numbers sum is n^2=11^2=121