Jawab:
78
Penjelasan dengan langkah-langkah:
1 = 1
3 = 1+2
6 = 1+2+3
Maka, suku ke-12 = 1 + 2+ 3+4+...+12
= [tex]\frac{12\times13}{2} =78[/tex]
Rumus penting : [tex]1+2+3+...+n=\frac{n(n+1)}{2}[/tex]
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Jawab:
78
Penjelasan dengan langkah-langkah:
1 = 1
3 = 1+2
6 = 1+2+3
Maka, suku ke-12 = 1 + 2+ 3+4+...+12
= [tex]\frac{12\times13}{2} =78[/tex]
Rumus penting : [tex]1+2+3+...+n=\frac{n(n+1)}{2}[/tex]