✨ Best Answer ✨
ハートのカードの枚数をx枚とおくと
問題から
xC2/10C2＝1/3
x(x−1)/2＝15
x^2−x＝30
x^2−x−30＝0
(x−6)(x＋5)＝0
x>0よりx＝6
したがって、ハートのカードの枚数は6枚
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