B₁ = 5;
q = 1/6;
S₃ = 5 · (1 — (1/6)³) / (1 — 1/6) = 215/36 = 5+35/36
S₆ = 5 · (1 — (1/6)⁶) / (1 — 1/6) = (6⁶ — 1) / 6⁵ = 46655/7776= 5+7775/7776
B₁ = 5;
q = 1/6;
S₃ = 5 · (1 — (1/6)³) / (1 — 1/6) = 215/36 = 5+35/36
S₆ = 5 · (1 — (1/6)⁶) / (1 — 1/6) = (6⁶ — 1) / 6⁵ = 46655/7776= 5+7775/7776