[Math4u] Sequence : converges and diverges

I am student of Bs-Mathematics. I need help in this question if
everybody tell me about this question and in future other questions, i
shall be very thankful for this kindness.
Q. Which of the sequence converges, and which diverges? Give reasons
for your answer.
1. an=n-1/n
2. an=((-1)^n+1)(n+1/n)

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