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What could be the first term in the sequence 45,135,405,1215, if 45 is the 3rd term

User Iamjoshua
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1 Answer

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To find the first term in the sequence, we need to determine the common ratio between consecutive terms.

Let's analyze the given sequence: 45, 135, 405, 1215.

We can observe that each term is obtained by multiplying the previous term by 3.

So, if 45 is the 3rd term, we can work backward to find the first term:

45 ÷ 3 = 15 (2nd term)
15 ÷ 3 = 5 (1st term)

Therefore, the first term in the sequence is 5.
User Rohit Jakhar
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