Bar is an aritmetika 9, 16, 23, 30,...,205 Diketahui : a= 9 b= 7 Ditnya : bnyak Suku=....?? Moon bantuannya

Question

Matematika Diposting : 2018-03-19 Diupdate : 2021-11-23 stylesclaudia0

Pertanyaan

Bar is an aritmetika 9, 16, 23, 30,...,205
Diketahui : a= 9 b= 7
Ditnya : bnyak Suku=....??

Moon bantuannya

Answer 1

Un = a + ( n - 1 ) . b
205 = 9 + ( n - 1 ) . 7
205 = 9 + 7n - 7
205 = 2 + 7n
203 = 7n
n = 29

Answer 2

Un = a+b(n-1)

= 9+7(n-1)

= 16(n-1)

=16n-1

N=16-1

=15