Question 94

Find the missing number in the following series.
1, 6, 15, (…), 45, 66, 91

Solution

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1, 6, 15,(?), 45, 66, 91

1 + 5 = 6

6 + 9 = 15

15 + 13 = 28

28 + 17 = 45

45 + 21 = 66

66 + 25 = 91

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