3
AssignmentMultiple Choice

Unit Test

Question 3 • TX-Pre-Calculus

Find the explicit rule for the given sequence.2, 3, 4.5, 6.75, 10.125, . . .

Answer
A
an = 2 + (n – 1)
B
an= 2(1.5)n–1
C
an = 2 + (n – 1)(1.5)
D
an = (1.5)n–1

Explanation

Each term is found by multiplying the previous term by 1.5: 3 ÷ 2 = 1.5 and 4.5 ÷ 3 = 1.5. This is a geometric sequence with first term 2 and common ratio 1.5, so its explicit rule is aₙ = 2(1.5)ⁿ⁻¹. Choice B gives this rule.

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