Tentukan hasil dari( tanpa menghitung satu persatu) = -100-99-98-...-2-1-0+1+2+...+48+49+50 = beserta caranya

-100-99...-50.....+50
=-50+50 = 0
=-100....-51
=-151 × 50 : 2 = -3775

a = -100
b = -99 -(-100) = 1

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

Sn = n/2(a + Un)
S₁₅₁= 151 /2 ( (-100) + 50)
= 151 / 2 . (-50)
= -3.775