Question 54

Complete the series
24, 60, 120, 210 _____

Solution

the difference between the numbers increases as multiples of 6.

The difference between the first two numbers is 6 x 6 = 36

The difference between the second and the third numbers is 6 x 10 = 60

The difference between the third and fourth numbers is 6 x 15 = 90

The difference between the fourth and fifth numbers is 6 x 21 = 126, etc

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