Question

#Trivia Rumus

Answer 1

Penjelasan dengan langkah-langkah:

a = 1 . 2 . 3 = 6

Un = n(n+1)(n+2)

Menentukan rumus Sn

Sn = n/2 ( a + Un)

Sn = n/2 ( 6 + (n(n+1)(n+2)))

Sn = n/2 ( 6 + ((n² + n)(n+2)))

Sn = n/2 ( 6 + (n³ + 2n² + n² + 2n))

Sn = n/2 ( 6 + (n³ + 3n² + 2n))

Sn = n/2 ( 6 + n³ + 3n² + 2n)

Sn = (6n + n⁴ + 3n³ + 2n²) / 2