Question

find the sum of the following number without actually adding the number :a) 1+3+5+7+9+11+13+15​

Answer 1

Answer:

64 is the answer

Step-by-step explanation:

hope that helps u

Answer 2

i.e. 121 = 1+3+5+7+9+11+13+15+17+19+21.

2

The sum of first 11 odd number =11 =121

Thus , 121 is a perfact square. Since, 55 cannot be expressed as the sum of successive old numbers starting from 1. ∴ 55 is not a perfact square.