Question

Hitunglah jumlah kelipatan 4 diantara 100 dan 300

Answer 1

A = 104
b = 4
Un = 296

Un = a+(n-1)b
Un = 104 + (n-1)4
Un = 104 + 4n - 4
Un = 100 + 4n

Un = 100 + 4n
296 = 100 + 4n
4n = 296-100
4n = 196
n = 196/4 = 49

Sn = n/2(a+Un)
S49 = 49/2 ( 104 + 296)
S49 = 24,5 x 400
S49 = 9800

Answer 2

Ya tinggal kelipatan biasa tapi mulai dari 100 jadi 104,108,112,116,120,124,128,132,136,140,144,148,152,156,160,164,168,172,176,180,184,188,192,196,200,204,208,212,216,220,224,228,232,236,240,244,248,252,256,260,264,268,272,276,280,284,288,292,296,300.