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Which of the following is not prime numb...

Which of the following is not prime number

A

17

B

19

C

27

D

29

Text Solution

Verified by Experts

The correct Answer is:
B
`O'A=O'O=OA`
`O'B=O O'+OB`
`O'C=O'O+OC`
`impliesO' A+O'B + O'C=3O'O+OA+OB+OC`

Since, `OA+OB+OC=O O'=-O'O`
`therefore O'A+O'B+O'C=2O'O`
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