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Udang San Diego hidup di suatu empang yang penuh dan kering secara berkala setiap tahunnya. Saat empang tersebut kering, udang bertahan hidup menjadi kista. Populasinya dibagi menjadi tiga kelompok. Kista yang bertahan selama satu periode kering (1 DP) berada pada kelompok pertama, bertahan selama dua periode kering (2 DP) berada pada kelompok kedua, dan bertahan selama tiga periode kering (3 DP) berada pada kelompok ketiga. Diagram Leslie berikut menyajikan dinamik dari ketiga kelompok populasi berikut.

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Sebanyak $\\var{a}$ kista kelompok pertama berada pada empang.

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Banyaknya kista yang ada setelah periode kering pertama $240$. Nilai $a$ pada diagram tersebut adalah $\\ldots$.

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Perkiraan populasi udang kelompok pertama setelah dua periode kering pertama adalah $\\ldots$.

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Perkiraan populasi udang kelompok kedua setelah dua periode kering pertama adalah $\\ldots$.

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