Brain Teasers
Too Many Ones
Find the next number in the series:
1
21
3111
4111111
51111111111
1
21
3111
4111111
51111111111
Answer
6111111111111111.The starting number increases by one so the next number starts with 6.
The sum of the digits in a number gives the number of ones in the next number. 5+1+1+1+1+1+1+1+1+1+1 = 15 so the next number has fifteen 1s.
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