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U5 = 3,24
U5 = ar^4 = 324
4.r^4 = 324
r^4 = 324/4 = 81
r= 3
S5 = a .(r^5 -1) / r-1
=4. (3^5 -1)/3-1
=4.(243 - 1)/2
= 2. 242
= 484