Question 3

Complete the series.
5, 30, 25, 125, 120, 480, (…)

Solution
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5, 30, 25, 125, 120, 480, (…)

$$5\times 6 =30$$

$$30-25 =5$$

$$25\times 5 =125$$

$$125-120 =5$$

$$120\times 4 =480$$

so next 

$$480-475 =5$$

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