suku ke-12 pada bilangan 1×2,3×4,5×6,...adalah... pake rumus!

U1 = 1 × 2
U2 = 3 × 4
U3 = 5 × 6
...
U12 = (2n - 1) × 2n
U12 = (2 × 12 - 1) × 2.12
U12 = 23 × 24