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Question

Question: The number <img src="https://cdn.pureessence.tech/canvas_655.png?top_left_x=600&top_left_y=300&width...

The number (91 times) is a.

A

Even number

B

Prime number

C

Not prime

D

None of these

Answer

Not prime

Explanation

Solution

(91 terms)

=1.(1091−1)10−1=(1013)7−11013−1×1013−110−1= \frac { 1 . \left( 10 ^ { 91 } - 1 \right) } { 10 - 1 } = \frac { \left( 10 ^ { 13 } \right) ^ { 7 } - 1 } { 10 ^ { 13 } - 1 } \times \frac { 10 ^ { 13 } - 1 } { 10 - 1 }

It is the product of two integers and hence not prime.