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  • Pengguna Brainly
2016-01-17T17:15:39+08:00
A = 5
T1 = 5
T2 = 10
T3 = 20
Tn < 1000
n = ?

r = 20 / 10
  = 2

Tn < 1000
1000 > 5 ( 2^n - 1 )
200 > 2^n - 1
log 200 > ( n - 1 ) log 2
log 200 / log 2 > n - 1
7.64 > n - 1
n < 8.64
n = 8
2 5 2
ok..nampak x yg 2 tu ada kuasa ( n-1 ) ? so kita buat kurungan dan bwk kedepan 2 pastu tulis log 2 = ( n-1 ) log 2
yg 200 tu just letak je perkataan log sbb dia xde kuasa,kita xpyh nk bwk apa2 ke depan dia
faham x?
faham
ok