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= (100/2)²
= 50²
= 2500
b) 1 - 2 = -1
3 - 4 = -1
100/2 × -1 = -50
c) (100+50+1)/2 × (-100 + 50) = 151/2 × -50
= -3775
= 50/2 (1 + 99)
= 50/2 x 100
= 25 × 100
= 2500
b) gunakan pola 2 angka 2 angka
1 - 2 = -1
3 - 4 = -1
krn setiap 2 angka hasilnya -1 maka
100/2 x -1 = -50
c) 0 + -1 + 1 = 0
-2 + 2 = 0
kita tinggal menjumlah a = -51 Un = -100 , n = 50
Sn = 50/2 (-51+-100)
= 25(-151)
= -3775