Brain Teasers
7, 10, 11, 13....
Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.Series
What would be the next number in this series?
7, 10, 11, 13, 17, 18, ?
7, 10, 11, 13, 17, 18, ?
Hint
Go back to a squareAnswer
20. Each new number is gained by adding the difference between n and the closest smaller perfect square to n.7-4=3...7+3=10
10-9=1...10+1=11
11-9=2...11+2=13
13-9=4...13+4=17
17-16=1...17+1=18
18-16=2...18+2=20
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