book Maths Puzzle Numerical Ability

4/x-1=3

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A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $12 Write the first five terms of the follownig sequence.
a sub n = n + 1/ n with the condition: a sub n= a sub n-1 + 2, where a sub n= 1