Penjelasan dengan langkah-langkah:
1. a. Un = a+(n-1)b
U12 = 2+(12-1)3
= 35
b. U12 = 35+(12-1)-4
= -9
2. a. Un =a+(n-1)b
= 6+(n-1)5
= 6+5n-5
= 5n+1
b. Un = 23+(n-1)-2
= 23-2n+2
= 25-2n
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Penjelasan dengan langkah-langkah:
1. a. Un = a+(n-1)b
U12 = 2+(12-1)3
= 35
b. U12 = 35+(12-1)-4
= -9
2. a. Un =a+(n-1)b
= 6+(n-1)5
= 6+5n-5
= 5n+1
b. Un = 23+(n-1)-2
= 23-2n+2
= 25-2n