Question

x=? 15supra x-1€ N va rog ajutati-ma

Answer 1

x-1 apartine N -> x-1 apartine divizorilor lui 15 = {1,3,5,15}
x-1=1
x=1+1
x=2

x-1=3
x=3+1
x=4

x-1=5
x=5+1
x=6

x-1=15
x=15+1
x=16

x=2; 4; 6; 16