Answer:
4096
Explanation:
The n th term of a geometric sequence is
= a
where a is the first term and r the common ratio
Here a = 1 and r = 2 ÷ 1 = 4 ÷ 2 = 2, thus
= 1 × = 4096
4.7m questions
6.2m answers
= a
= 1 × 
= 4096