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= 20/2 (2.6 + 20-1). -2)
= 10 (12 + 19. -2)
= 10 (12 -38)
= 10 (-26)
= -260
C. b= U2-U1
= 2/5-1/2
= 4/10 - 5/10
= -1/10
S15 = n/2 (2a + (n-1)b)
= 15/2 (2.1/2 + (15-1). -1/10)
= 15/2 (1 + 14. -1/10)
= 15/2 (1 - 7/5)
= 15/2 (5/5-7/5)
= 15/2 (-2/5)
= -3
Ada yg aneh ==" setahu sy jumlah itu tdk boleh negatif tp hasilnya segini.
= 10 * 26
= 260