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U5 = a+4b = 6
a+2b=16
a+4b=6
----------- -
-2b = 10
b = 10/-2
b = -5
a+2b = 16
a+2.-5 = 16
a+ -10 =16
a = 16 + 10
a = 26
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u3 = ar^2 = 16
u5= ar^4 = 6
r² = ar^4/ar^2 = 6/16
r = √6/4
ar² = 16
a x 6/16 = 16
a = 16 x 16/6
a= 256 /6 = 128/3