If the 5th term in a geometric sequence is 162, and the common ratio is 3. What is the first term in the sequence?
1 answer:
Answer:
2
Step-by-step explanation:
a2 = a1×3
a3 = a2×3 = a1×3×3
=>
an = an-1 × 3 =

a5 = 162 = a1×3⁴ = a1×81
a1 = 162/81 = 2
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