without adding,find the sum of 1+3+5+7+9+11+13+15+17
vamshi16:
81
Please someone give me this answer
already gave
Answers
Answered by
1
It's N^2. where n is the number of terms. You can prove this by using sum of a Arithmetic progression.
Answered by
0
18*4 + 9 = 81
Add first and last numbers
Second and second to last
And so on.
Or simply arithmetic progression.
Add first and last numbers
Second and second to last
And so on.
Or simply arithmetic progression.
Similar questions