Question

2+4+6+8+....+288 urgent

Answer 1

288+2=290
(288-2):2+1=286:2+1=143+1=144
S=(144×290):2
S=72×290
S=20880

Answer 2

S = 2 + 4 + 6 + 8 +....+ 288=

= 2×(1 + 2 + 3 + 4 +....+ 144)

(1 + 2 + 3 + 4 +....+ 144) - suma Gauss cu formula de calcul S1=[n×(n+1)]:2=
S1=(144×145):2=

S=2×S1=2×(144×145):2=144×145=20880