Question

without adding find the sum of 1+3+5+6+7+9+11+13+15+17 and answer is 81 give reason​

Answer 1

Answer:

this answer is 81

because then we add odd no. regular that show in question like

1+3+5+7+9+11 +13+15 +17

Answer 2

Answer:

Step-by-step explanation:

• ★first count the number of numbers
• there are nine numbers 1,3,5,7,9,11,13,15,17

now,

• since they are all odd the sum is the square of the total no of numbers
• that means the sum is 9 power 2 which is 81.
• this only works for consecutive odd numbers.

I hope this may help you.