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Un = 2n - 1
U35 = 2 (35) -1
= 70 - 1
= 69
Rumus suku ke-n
__________
a + ( n - 1 ) b
__________
Dik ;
• a = 1
• b = 2
Dit ;
♦ Un = . . . ?
♦ U35 = . . . ?
Jawab
======
♦ Un
Un = a + ( n - 1 ) b
Un = 1 + ( n - 1 ) 2
Un = 1 + 2n - 2
Un = -1 + 2n
♦ U35
U35 = -1 + 2n
U35 = -1 + 2(35)
U35 = -1 + 70
U35 = 69
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