bantu jawab dongggg :D
Jawab:
Penjelasan dengan langkah-langkah:
c. 1 + 2 + 3 + ... + 30 = ...?
a = 1, b = 2 - 1 = 1, n = 30
S30 = (30/2) (2(1) + (30 - 1)(1))
S30 = 15 (2 + 29)
S30 = 15 (31)
S30 = 465
d. 3 + 4 + 5 + ... + 50 = ...?
a = 3, b = 4 - 3 = 1, n = 48
S48 = (48/2) (2(3) + (48 - 1)(1))
S48 = 24 (6 + 47)
S48 = 24 (53)
S48 = 1.272
e. 1 + 3 + 5 + 7 + ... + 49 = ...?
a = 1, b = 3 - 1 = 2, n = 25
S25 = (25/2) (2(1) + (25 - 1)(2))
S25 = (25/2) (2 + 48)
S25 = (25/2) (50)
S25 = 625
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