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karena memuat paling sedikit 1 kelereng maka:
1/2 x 10C5 = 1/2 x 10!/(5!5!)
= 1/2 x 252
= 126
12. Tinggal turunkan saja
lim (A/2 (Ax + B)^-1/2) = 1
x->0
masukan x = 0 maka didapat:
(A/2)(1/√B) = 1
A = 2√B
kuadratkan:
A² = 4B
Jawaban: C