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ar^2 + ar^4 = 25
U4 + U6 = 12,5
ar^3 + ar^5 =12,5
ar^3 + ar^5 =12,5
ar^2 + ar^4 = 25
............................ -
r^1 + r^1 = - 12,5
2r^1 = -12,5
r^1 = -6,25 = U2
selisih
U3 + U5 = 25 selisih = 5-3 =2
U4 + U6 = 12,5 selisih 6-4 = 2 jadi selisih sama jadi a=2
U3 = U1 + U2
= 2 + -6,25
= -4,25