Question

Determinati € N: a) 1 supra 2<n supra 24<7 supra 8

b) 9 supra 10 <2n+3 supra 20< 6 supra 5.

Va rooogg!!

Answer 1

a)
1/2<n/24<7/8
12<n<21
n∈(12,21)∩ N 
==> n{13,14,15,16,17,18,19,20}
b)
9/10<2n+3 /20 <6/5
18<2n+3<24
15<2n<21
7.5<n<10.5
n∈(7.5,10.5)∩N
==> n{8,9,10}