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4 years ago

If the 5th term in a geometric sequence is 162, and the common ratio is 3. What is the first term in the sequence?

Mathematics

1 answer:

Lana71 [14]4 years ago

3 0

Answer:

Step-by-step explanation:

a2 = a1×3

a3 = a2×3 = a1×3×3

an = an-1 × 3 =

$a1 \times {3}^{n - 1}$

a5 = 162 = a1×3⁴ = a1×81

a1 = 162/81 = 2

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