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a+3b=14. l x1. a+3b=14
2a+12b=46. l x 1/2. a+6b=23
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-3b = -9
b=3
a+3b=14
a+9=14
a=5
S11 =11/2 (2a+10b)
= 11a+55b
= 11 . 5 + 55 . 3
=55+165=220
2. a=1. r=5
U5= ar pangkat 4
= 1 . 5 pangkat 4 = 625