if n is a positive odd integer, then show that n²-1 is divisible by 5​

1 thought on “if n is a positive odd integer, then show that n²-1 is divisible by 5​”

1. Answer:

   the square of a odd no. is always odd.

   so odd no. -1 = even no.

   so even may or may not be perfectly divisible by 5

   hope it helped 🙂

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