please tolong dijawab yaa aku ga maksa klo ga ngerti hehe -100-99-98-...-2-1-0+1+2+...+97+98+99 please jawab yaa yg cantik maupun ganteng wkwk

a = -100
b = U2 - U1 = -99 - (-100) = 1
Un = 99

Un = a + (n - 1)b
99 = -100 + (n - 1).1
99 = -101 + n
99 + 101 = n
200 = n

Sn = n/2 (a + Un)
S200 = 200/2 (-100 + 99)
S200 = 100 . (-1)
S200 = -100

Semoga membantu dan semoga bermanfaat...