what really is the formula for finding the sum of terms in a geometric/arithmetic sequence. i have seen some posts that say:
sum of terms = a(1-r^n)/(1-r) (where a is first term, r is ratio and n is # of terms)
and others that say:
sum of terms = a(1-r^n)(1-r) (where a is first term, r is ratio and n is # of terms)
Please help clarify this for me..am really confused. googling it shows the first one as the correct one. Just want to confirm.
Thanks.
sum of terms = a(1-r^n)/(1-r) (where a is first term, r is ratio and n is # of terms)
and others that say:
sum of terms = a(1-r^n)(1-r) (where a is first term, r is ratio and n is # of terms)
Please help clarify this for me..am really confused. googling it shows the first one as the correct one. Just want to confirm.
Thanks.
