Răspunsuri

2014-10-30T10:38:51+02:00
N = 29c + r     r = 2c    n=29c + 2c = 31c  ⇒ c=nr. par  r < 29 
r=nr. par ⇒ r∈{2,4,6,8,.......28} ⇒ c∈{2,4,6,8,10,12,14} ⇒
n∈{62,124,186, 248,310,372,434}
S = 62·1+62·2+62·3+........+62·7=62(1+2+3+.....+7) = 62·7·8/2
S = 1736
8 4 8