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-33= a ((-2 pangkat 5) -1) /1-(-2)
-33= a (-32)-1 / 3
-33= a (-11)
a= 3
n3 = a.r pangkat n-1 = 3 . -2 pangkat 3-1 = 3 .4 = 12
n4 = a.r pangkat n-1 = 3. -2 pangkat 4-1 = 3 . -8 =-24
n3 + n4 = 12+(-24) = -12