Mathematics · Number Series Test
How many such 1s are there in the following number sequence which are neither immediately preceded by 7 nor immediately followed by 5? 9 1 4 9 7 7 1 8 7 1 7 1 9 9 1 9 1 6 4 1 9 2 1 7
- 1five✓
- 2four
- 3six
- 4three
Correct answer
five
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