Question

Aflati ultima cifra a nr.:
n=$5^{130} + 2^{102} +3* 7^{41}$

Answer 1

u(5^130)=..5
u(2^102)=u(2^4×25)*2^2=6*4=4
u(3*7^41)=u(1)^41=1
u(n)=5+4+1=0
R:0