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The 7th, 8th and 9th terms of a sequence are 61,69 and 77 respectively. Find a formula to describe this sequence.
in Mathematics by Diamond (64.2k points) | 557 views

1 Answer

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Best answer

Looking at the differences,
seq
you can conclude that the sequence must be of the form
\[
u_{n}=8 n+c .
\]
For \(n=7, u_{7}=56+c\), giving \(c=5\).
Thus the formula to describe the sequence is
\[
u_{n}=8 n+5 .
\]

by Diamond (64.2k points)

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