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1/a = k
Maka,
a = 1
r = k
Sehingga,
S₅ = 341
Ambil solusi bilangan bulat.
k = 1 (Tidak memenuhi jika disubstitusi)
k = 4 (Memenuhi)
Sehingga,
k = 1/a
4 = 1/a
a = 1/4