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16 October, 19:15

The nth term of a sequence is n²+4

Alex says: "The nth term of the sequence is always a prime number when n is an odd number."

Alex is wrong.

Give an example to show that Alex is wrong.

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Answers (1)
  1. 16 October, 22:09
    0
    9.

    9 squared is 81. 81+4=85. 85 is divisible by 5.
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