Question

Cine imi face si mie acest exercitiu primeste 50 de puncte

Answer 1

4|n+1⇒n+1=4k, k∈N
            n=4k-1
12≤n<36
12≤4k-1<36
13≤4k<37
3 intregi 1/4 ≤k <9 intregi 1/4
Cum K∈N⇒K∈{4,5,6,7,8,9}
pt K=4⇒n=15
pt k=5⇒n=19
pt k=6⇒n=23
.
.
.
pt k=9⇒n=35
Asadar: 
S:n∈{15,19,23,27,31,35}