- #1
roger
- 318
- 0
Please can someone help me with arithmetic series.
I don't understand why you reverse the sum when summing 1 to 100.
also I don't understand the formula given : sn = n/2 ( 2a+(n-1)d )
thanks
Roger
I don't understand why you reverse the sum when summing 1 to 100.
also I don't understand the formula given : sn = n/2 ( 2a+(n-1)d )
thanks
Roger