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```
Show that 11111111111111111111111111......1 (91times) is not a prime number.
Show that 11111111111111111111111111......1 (91times) is not a prime number.

```
3 years ago

Arun
25768 Points
```							11111111.....(91 times) is a composite number.Because it is divisible by 1111111. Proof-11111.....(91 times) can be expressed as- = 1/9 * (1091 - 1) = 1/9 * (107 - 1) * x = 1111111 * xWhere x = (107)12 + (107)11.....+ 1
```
3 years ago
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• 101 Video Lectures
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• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions