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Numbers

Which of the following numbers are prime numbers?
A. 2208 + 1
B. 2210 + 1
C.  2205 + 1

1. A and B
2. A and C
3. B and C
4. None of the above .

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6 comments

  1. Nidhi Agarwal

    Since none of the above can be written in 6k+1 form (3 missing) it is option 4

  2. Abhishek Tandon

    Prime no.s are of the form 6k+/-1
    Here none of them is of the form of prime no.
    Hence option 4

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