Question

6,9,12,15,......... 63
|
u1
tentukan Jumlah 10 suku perrtama (s10)

Answer 1

Sn=1/2n(u1+un)
s10 = 1/2 10(2.6+(10-1)3)
s10 = 5(39)
s10 = 195

Answer 2

Sn= n/2( 2a + (n-1)b)
s10 =10/2 (2×6 +(10-1) 3)
=5(12+27)
= 5× 39
=195