✨ Best Answer ✨
1回の確率1/3×2/3×2/3×3=4/9
2回の確率1/3×1/3×2/3×3=2/9
3回の確率1/3×1/3×1/3=1/27
よって
1×4/9+2×2/9+3×1/27=1
この問題の解説お願いします。
答えは1です
✨ Best Answer ✨
1回の確率1/3×2/3×2/3×3=4/9
2回の確率1/3×1/3×2/3×3=2/9
3回の確率1/3×1/3×1/3=1/27
よって
1×4/9+2×2/9+3×1/27=1
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1×4/9+2×2/9+3×1/27=1