Question

a) 2 + 4 + 6 + .....98 + 100
b) 3 + 6 + 9 +.......+ 180
c) 4 + 8 + 12 +......+ 360
d) 5+ 10 + 15 + .....+ 625

Answer 1

a)2+4+6+......+98+100=100x101:2=10100:2=5050

b)3+6+9+......+180=180x181:2=32580:2=16290

c)4+8+12+......+360=360x361:2=129960:2=64980

d)5+10+15+....+625=625x626:2=391250:2=195625