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CSCA-Style Example

Sum of first 5 terms of 3, 6, 12, 24, …

Geometric (ratio = 2). Use the geometric sum formula.

Step-by-step solution

a_1 = 3, \;\; r = 2, \;\; n = 5Identify the parameters
S_n = \frac{a_1(r^{n} - 1)}{r - 1}Geometric sum formula
S_5 = \frac{3(2^{5} - 1)}{2 - 1} = \frac{3 \cdot 31}{1}Substitute
= 93✓ Final answer