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The way of asking the question is wrong. It is known as common difference not common ratio.

Here a = 1 , d= 3 a7=?

we know that , an = a + (n-1)d

a7= 1 +6x3= 19

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13y ago
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Q: What is the seventh term of a sequence whose first term is 1 and whose common ratio is 3?
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