Probability with Counting Principles Permutation Combination Concepts

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The six digits 4, 5, 6, 7, 7, 7 can be arranged to give many different 6 digits numbers.
1) how many of these 6 digits numbers start with an odd digit and end with an odd digit?

nishanhamal
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Hope you are good sir,
Sir have you posted any introductory video related to permutation and combinnation?

erumfawwad