Question

Nilai dari 3+6+12+.....+192 adalah

Answer 1

A=3
b=3

n=(Un-a+b)b
n=(192-3+3)/3
n=192/3
n=64

Sn=n/2(a+Un)
S64=64/2(3+192)
S64=32(195)
S64=6240

jadi 3+6+12+.....+192 =6240

Answer 2

3+6+12+.....+192 = 3 x (1+2+3+....+64)
= 3 x [(1+64)/2]x64
= 3 x 65 x 32
= 6240