3 years ago

The test has 50 questions on it, you miss 25 questions, what percent did you get?

1 answer:

6 0

If a test had 50 questions on it, and you missed 25 of them, that would mean that you got a 25/50, which, when divided, equals 1/2 or 0.5, which converts into 50%.

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About the easiest way to do this for small values of n is to compute each of the terms using the given recurrence relation.

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_____

<em>Alternate solution</em>

You recognize that the recurrence relation describes a geometric sequence with a first term of 4 and a common ratio of -3. The n-th term of a geometric sequence is ...

$a_n=a_1\cdot r^{n-1} \qquad\text{for first term $a_1$ and common ratio $r$}$

Then the 4th term will be ...

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