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r = 3
n=5
U5 = U1xr^4
= 9 x 3^4
= 3² x 3^4
= 3^6
= 729
U1= 1 (drkataSEUTASTALI)
r=3
dit: U5..?
jwb
U5= ar^n-1
1.3^5-1
1.3^4
1.81= 81
smg mmbntu:)