Question

1+3+5+7+9+11+13+15+17+19​

Answer 1

the simple method to find it.

count the digit and multiply that only by that number...

here are 10 digits.

so 10*10 = 100.

hope this will help you.

thank you

Answer 2

Answer:

100

Step-by-step explanation:

1+3=4

4+5+7=16+9+11=36+13=49+15=64+17=81+19=100

another method:sum of first n odd natural numbers=n^2

here n=10

so sum=n^2=10^2=100