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combination question

there are 7 letters and 7 directed envelopes the number of ways could all the letters be put into wrong envelope i)681 ii)1236 iii)1854 iv)1976

Note by Indrasish Paul
3 years, 8 months ago

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See this. Kishan K · 3 years, 8 months ago

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@Kishan K yes ... so answer will be \( D_7 = \boxed{1854} \) Piyushkumar Palan · 3 years, 8 months ago

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