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u1 = 2r^0 = 2
u6 =2r^5 = 64
---------------------- ÷
= r^5 = 32
r = 2
2 (×2), 4 (×2), 8 (×2), 16(×2), 32 (×2), 64
2+4+8+16+32+64 = 126
jumlah usia keenam anak adalah 126
semoga membantu :)
maaf pas penjumlahan aku lupa rumusnya, jd pake cara manual ^^;