Bobosharif S. answered 03/14/18
Tutor
4.4
(32)
Mathematics/Statistics Tutor
n(n+1)=1.5n2
n2+n=1.5n2
0.5n2-n=0
n(0.5n-1)=0. Since 0 is not a natutal number, 0.5n=1
n=2
n+1=3
So, the answer is 2 and 3