Tag: Hard

Find the number that comes next – Series (3, 7, 12, 14…)

Difficulty: Medium

Find the number that comes next in the following series:

3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, ?

Hint

Libri tres.

Click here for Solution

91 is the next number.

The hint is Latin for “three letters”. This is the series of Roman Numerals consisting of three symbols.

3 – III
7 – VII
12 – XII
14 – XIV
16 – XVI
19 – XIX
21 – XXI
25 – XXV
30 – XXX
41 – XLI
45 – XLV
52 – LII
54 – LIV
56 – LVI
59 – LIX
61 – LXI
65 – LXV
70 – LXX

91 – XCI

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