Question

determinati suma cifrelor nr A=10 la puterea 2017+2*10 la puterea 2016+1

Answer 1

A=10^2017+2*10^2016+1=
=10^2016*(10+2)+1=
=10^2016*12+1=
=12000...........00001
        (2015 zerouri)
suma cifrelor lui A  =1+2+2015×0+1=4