- #1
bananaman13
- 2
- 0
I don't understand on how to get the answer of a certain problem in arithmetic series.
formula/s:
Arithmetic means
An=A1+ (n-1)d
Arithmetic series
Sn=n/2 (A1+An)
I understand on how to get the terms to these but when finding for:
Find A1 if,
S10= -20 , d= 4
&
Find S12 if, 2+5+8+...
I couldn't quite grasp the idea on how to apply the formulas to these problems.
Any help is appreciated. Thank you very much
formula/s:
Arithmetic means
An=A1+ (n-1)d
Arithmetic series
Sn=n/2 (A1+An)
I understand on how to get the terms to these but when finding for:
Find A1 if,
S10= -20 , d= 4
&
Find S12 if, 2+5+8+...
I couldn't quite grasp the idea on how to apply the formulas to these problems.
Any help is appreciated. Thank you very much