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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
r = U2 : U1
r = (2/5²) : 2/5
r = 2/25 x 5/2
r = 1/5
S∞ = a/(1 - r)
S∞ = 2/5 / (5/5 - 1/5)
S∞ = 2/5 / (4/5)
S∞ = 2/5 . 5/4
S∞ = 1/2