We have to determine the set of natural numbers in which n lies given that : 2/5=<(n+1)/10=<1/2

2/5=<(n+1)/10=<1/2

multiply all the terms by 10

=> 4 =< (n +1) =< 5

subtract 1 from all the terms

=> 4 - 1 =< n + 1 - 1 =< 5 - 1

=> 3 =< n =< 4

**Therefore n lies in the set [ 3 , 4]**

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