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u9 ====> a+9b = 36
eliminasi pers. 1 dan 2
a+2b=12
a+8b = 36
___________ -
-6b = -24
b= 4
substitusi b = 4 ke pers. 1
a+ 2(4)= 12
a=4
52= a+ (n-1)b
52= 4+ (n-1)4
52= 4+ 4n-4
52= 4n
n= 13
jadi 54 merupakan suku ke 13
jawaban E