Question

Write the Explicit Formula for the sequence 4, 2, 1, 0.5

Answer 1

option a is the answer

Answer 2

Option A, aₙ = 4 (0.5)ⁿ⁻¹

Explanation:

We know that the common ratio (r) is: 0.5

and first term in the sequence (a₁) is: 4

and the fact this is a geometric series, therefore the sequence would be:

=> aₙ = a₁ * (r)ⁿ⁻¹

=> aₙ = 4 (0.5)ⁿ⁻¹

Hope this helps!