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S1 = 5^(2*1) -1 = 5^1 -1 = 24
S2= 5^(2*2) -1= 5^4 -1 =625-1= 624
S3 = 5^(2*3)-1 = 15.624
S4 = 5^(2*4)-1 = 390.624
U2 = S2 - a = 624-24 =600
r = u2/a = ar /a
r = 600/24 = 25
u4 = ar^3
= 24 x 25^3
= 375.000
atau bisa juga
u4 = S4 - S3
= 390.624 - 15.624
= 375.000