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Grade: 11 

                        
Show that 11111111111111111111111111......1 (91times) is not a prime number.
3 years ago

Answers : (1)

Arun
24742 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 * x
Where x = (107)12 + (107)11.....+ 1
3 years ago
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