Contoh 1
Soal: Hitung ∑_(i=1)^5 i
Jawaban: 1 + 2 + 3 + 4 + 5 = 15
Contoh 2
Soal: Hitung ∑_(i=1)^4 i²
Jawaban: 1² + 2² + 3² + 4² = 1 + 4 + 9 + 16 = 30
Contoh 3
Soal: Hitung ∑_(i=1)^5 3i
Jawaban: 3×1 + 3×2 + 3×3 + 3×4 + 3×5 = 3 + 6 + 9 + 12 + 15 = 45
Contoh 4
Soal: Hitung ∑_(i=1)^4 (2i + 1)
Jawaban: (2×1 + 1) + (2×2 + 1) + (2×3 + 1) + (2×4 + 1) = 3 + 5 + 7 + 9 = 24
Baca juga:
Unveiling Liz Crokin: Between Journalism and Public Controversy
Contoh 5
Soal: Hitung ∑_(i=2)^5 (i² – i)
Jawaban: i=2 → 2² – 2 = 2
i=3 → 3² – 3 = 6
i=4 → 4² – 4 = 12
i=5 → 5² – 5 = 20
Jumlah = 2 + 6 + 12 + 20 = 40
Rumus cepat sigma: ∑(i=1)^n i = n(n+1)/2
∑(i=1)^n i² = n(n+1)(2n+1)/6
∑_(i=1)^n i³ = [n(n+1)/2]²
Penulis:Loveyta
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