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U6=ar^5=243
U4=ar³=27
--------------------- :
r²=9
r=√9
r=3
a=1
Un=arⁿ-¹
Un=1.3ⁿ-¹
Un=3ⁿ-¹
U8=3^7=2187
b).
U6=ar^5=10
U2=ar=10
-------------------- :
r⁴=1
r=1
a=10
Un=arⁿ-¹
Un=10.1ⁿ-¹
Un=10
U9=10