Question

Intrun cos sunt oua .Daca le numaram cate 2,3,4,5 sau 6 de fiecare data ramane un ou in cos .Cate oua sunt in cos?

Answer 1

x:2=a r=1
x:3=b r=1
x:4=c r=1
x:5=d r=1
x:6=e r=1
⇒ x=2a+1 ; x=3b+1; x=4c+1; x=5d+1; x=6e+1
x-1=2a ; x-1 = 3b ; x-1 = 4c ; x-1 = 5d; x-1= 6e
⇒ x-1 este multiplu de 2,3,4,5,6
cmmmc = 4 x 3 x 5=60⇒ x-1=60⇒ x=61 oua