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[" 3.How many 4-letter code can be forme...

[" 3.How many 4-letter code can be formed using the first 10letters of the English "],[" alphabet,if no letter can be repeated? "],[" 4.How many 5-digit telenhone numbers "]

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

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

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

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

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

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

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

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

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