Question: Do I need to know formulas for these? How many 6-letter code symbols can he formed from the letters from the word PLANTS without repetition?

Do I need to know formulas for these?

Do I need to know formulas for these? How many 6-letter codesymbols can he formed from the letters from the word PLANTS withoutrepetition? How many B-letter code symbols can be formed from the letters

How many 6-letter code symbols can he formed from the letters from the word PLANTS without repetition? How many B-letter code symbols can be formed from the letters from the word PLANTS without repetition\"?I |:| In a certain country, area codes have three digits and are subject to the following restrictions. The first digit cannot be 0 or 1; the second digit can only be 0 or 1; and there are no restrictions on the third digit. How many different area codes are possible? Express the number of area codes as a product. Total number of area codes =] (Do not multiply.)How many three-digit numbers may be formed using elements from the set {1, 2, 3, 4, 5, 6, 7, 8, 9} if no element may be used more than once in a number and the number must be even? ways

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