Question

pls answer this question .....​

Answer 1

Answer:

210

Step-by-step explanation:

We start from any ball the sum of all numbers will be same to the sum of

all balls from 1 to 20

Now we know that sum of 1 to n natural numbers

=n*(n+1)/2

Hence sum of numbers on all 20 balls from 1-20

=20*21/2=10*21

=210