Sum of a geometric progression
Answers are for parents and teachers.
1
Find the sum of the first 7 terms of 3 + 6 + 12 + ...
381
2
Find 1 + 4 + 16 + 64 + 256.
341
3
If b₁ = 10, q = 1, n = 12, find S₁₂.
120
4
How many terms of 1 + 2 + 4 + ... are needed for the sum to equal 511?
9 terms: 2^n = 512 = 2⁹.
5
Find 6 + 3 + 3/2 + 3/4.
11.25