How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

Question

TextMultiplication Principle of Counting

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Given 4 flags of different colours, how many different signals can be generated, if a signal requires the use of 2 flags one below the other?

How many 2 digit even numbers can be formed from the digits 1, 2, 3, 4, 5 if the digits can be repeated?

How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that

How many 3-digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 if the digits can be repeated?

How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

A coin is tossed 3 times and the outcomes are recorded. How many possible outcomes are there?