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u7 = ar^6 = 625
r² = ar^6/ar^4 = 625/25 =25
r = √25 = 5
ar^4 = 25
a x 5^4 = 25
a x 625 = 25
a = 25/625 = 1/25
u3= ar^2 = 1/25 x 5^2 = 1/25 x 25 = 1