Question

-100-99-98-...-2-1-0+1+2+...+48+49+50 Tolong ni jwbnya ap??? tulis caranya ya! ni bahan ulangan.... plisss

Answer 1

a = -100
b = u2 - u1
   = -99 - (-100)
   = 1
Un =a + (n-1) b
50 = -100 + ( n -1) 1
50 = -100 + n - 1
50 = -101 + n
50+101 = n
151 = n
jumlah semua suku
Sn = n/2 (a+Un)
     = 151/2 (-100 + 50)
     = 151 ( -50)
     = 151(-25)
     = -3775