Răspuns :
Răspuns
n = 2 x ( 19 x ( 19 + 1 ) : 2 ) + 20
n = 2 x ( 19 x 20 : 2 )+ 20
n = 2 x (380 : 2) + 20
n = 2 x 190 + 20
n = 380 + 20
n = 400
Răspuns
n = 2 x ( 19 x ( 19 + 1 ) : 2 ) + 20
n = 2 x ( 19 x 20 : 2 )+ 20
n = 2 x (380 : 2) + 20
n = 2 x 190 + 20
n = 380 + 20
n = 400