Here are the first three stages of a
sequence of dots. If we drew each of the
first 15 stages, how many dots would we
have to draw? Select all of the
expressions representing this number.
A:
3(1+3+3²+...+3¹4)
B:
1-315
1-3
C:
(1 − 3)(1 +3 + 3² +...+3¹4)
D:
3
1-315
1-3
E:
3(1 − 3)(1+3+3²+...+3¹4)