Question

Cum se rezolva : 2+4+6+8+............+200=
Va rog am nevoie de mult ajutor!!!

Answer 1

2+4+6+8+............+200= 2*(1+2+3+ ...+ 100) = 2*[(100*100+1)]/2=100*101= 10100

- dai factor comun pe 2 si apoi folosesti suma lui Gauss

Answer 2

=2(1+2+3+4+,,,,+100)
=2(101x100)/2
=100x101
=10100