Question

4 Find the sum of the following numbers without actually adding the numbers. 1 + 3 + 5 + 7 + 9 + 11 +13 + 15 b 1+3+5+ 7 + 9 + 11 + 13 + 15 +17 1+3+5+7​

Answer 1

Answer:

1. 64

2. 81

3. 16

Step-by-step explanation:

Find the number of odd numbers in the question and if the number of odd numbers is x then the sum will be the square of x

Answer 2

Step-by-step explanation:

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

= 1+17 = 18

= 3+15 = 18

= 5+13 = 18

= 7+11 = 18

= 9 = 9

Ans = 81