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Verified answer
U1 = a = 6u4 = ar³ = 48
48 = (6)r³
48/6 = r³
r³ = 8
r = 2
S10 = a(rⁿ - 1)/(r - 1)
= 6(2^10 - 1)/(2-1)
= 6(1.024 - 1) / 1
= 6(1.023)
= 6.138