We'll multiply the inequality by
10:
10*2/5 =< 10*(n+1)/10 = <
10/2
We'll simplify and we'll
get:
4 =< n + 1 =<
5
We'll solve the left
inequality:
4 =< n +
1
We'll subtract 1:
n
>= 3
We'll solve the right
inequality:
n + 1 =<
5
We'll subtract 1:
n
=< 4
The n natural values of the set
are: {3 ; 4}.
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