Question

without adding find the sum 1+3+5+7+9+11+13+15+17+19​

Answer 1

(1+19)+(3+17)+(5+15)+(7+13)+(9+11)
= 20+20+20+20+20
= 100

Answer 2

Answer:

the answer is 100.

Step-by-step explanation:

there are ten odd numbers which are in addition to each other . now you know that it that sum of consecutive odd numbers is square of the number of odd numbers added so there are ten odd numbers and the answer is

${10 }^{2}$

=100 .