Question

Kak, tolong bantu menjawab soal nomor 6 dong kak.......
plis kak

Answer 1

~Jawab~


U1 = a = 3¹ = 3

U2 = 3² = 9

r = 9/3 = 3

karena r>1, maka:

Sn = a( rⁿ - 1 ) / ( r - 1 )

Sn = 3( 3ⁿ - 1 ) / 2

Sn = 3 × 3ⁿ - 3 / 2

Sn = 3¹ × 3ⁿ - 3 / 2

Sn = 3ⁿ⁺¹ - 3 / 2