-100-99-98-...-2-1-0+1+2+...+48+49+50 pakai jalan

Matematika
Pola Bilangan VII SMP

Pembahasan :
Un = 50
a + (n - 1)b = 50
-100 + (n - 1)1 = 50
-100 + n - 1 = 50
n - 101 = 50
n = 151

-100 - 99 - 98 - ... + 50
= S151
= 151/2(-100 + 50)
= 151/2(-50)
= -3775