Brain Teasers
1, 5, 9, 15, ?
Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.Series
What is the next number in the sequence:
1, 5, 9, 15, ?
1, 5, 9, 15, ?
Answer
The numbers represent the position in the alphabet of the letters a, e, i, and o which are the first four vowels. The next number in the sequence is therefore 21 which represents the letter u.Hide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments
1+4=5, 5+4=9, 9+6=15, 15+6=21 next would be 21+8=29, 29+8=37, etc.
very clever, liked it a lot!
I think a hint would be in order.
To post a comment, please create an account and sign in.
Follow Braingle!