# MATH

Halley's comet appears in the sky approximately once every 77 years. If the comet was seen in by Astronomer Edmund Halley in 1531. How many times has the comet been spotted since?

1. 👍 0
2. 👎 0
3. 👁 57
1. (2011 - 1531)/77 = ?

1. 👍 0
2. 👎 0

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