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Beda suku = 9
Maka (212-1) x 9 = 1899
14,23,32...212
b = 23-14 = 9
a = 14
Un = 212
Un = a+(n-1).b
212 = 14+(n-1).9
212=14+9n-9
-9n=14-9-212
-9n=-207
9n=207
n=207/9
=23