which is it?
sequence or series?
2, 3, 5, 7, 11, 13
*bonus: name the pattern*
sequence
*bonus: prime numbers*
find the common difference or the common ratio:
78, 75, 72, 69, 66, ...
d=-3
what is the explicit formula for arithmetic sequence?
an=a1+(n-1)d
find the sum:
1-1/2+1/4-1/8+...
2/3
finite or infinite?
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
finite
find the common difference or the common ratio:
3/32,3/16,3/8,3/4,3/2,...
r=2
what is the explicit formula for a geometric sequence?
an=a1*r^(n-1)
sum_(n=1)^8(3n+1)
116
arithmetic, geometric, or neither?
-4, 2, 8, 14
arithmetic
find the common difference or the common ratio:
1620, 540, 180, 60, ...
r=1/3
what is the formula for the sum of an infinite geometric series?
S=(a1)/(1-r)
sum_(n=2)^6(-2)^(n-1)
-22
Find the sum:
6+5+25/6+...
36