Question 99

Complete the series.
186, 183, 177, 159, (…)

Solution

186, 183, 177, 159, (…)

$$186-183=3$$

$$183-177=6=3\times 2$$

$$177-159=18=6\times 3$$

$$159 - () = 72=18\times 4$$

$$159- 72 = 87$$

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