8 cards and 8 envelopes are numbered 1 1 2 3 4 5 6 7 and

Last updated: 7/4/2023

8 cards and 8 envelopes are numbered 1 1 2 3 4 5 6 7 and cards are to be placed in envelopes so that each envelope contains exactly one card and no 6 9 21 21 42 card in the envelope bearing the same number 2 0 Also cards and nu envelopes of same number no 10 of ways in which 2715 2433 are identical Then find the it can be done