Mathematics
Senior High
⑵がわからないのでやり方教えてください!
n28 educationの9文字を1列に並べるとき, 次の問に答えよ。
(1と 母音と子音が交互に並ぶ並び方は何通りあるか。
(2) dとtの間に2文字入る並べ方は何通りあるか。
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