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2 years ago

7

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

1 answer:

galben [10]2 years ago

7 0

Abcdefg
There cannot be more than two because there are only two vowels, e and a. But it has to be 4 lettered, which limits a lot of option, so there can only be one 4-letter code.

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You have to follow the P.E.M.D.A.S., this is:

P:Parentheses first.

E:Exponent next.

M:Multiplication.

D:Division.

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A: Addition.

S: Subtraction.

(Addition and Subtraction is whichever come first, from left to right).

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First we have to solve the multiplication:

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2. 10+2.(4-1)

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Now the multiplication and then the addition.

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Now we have to solve the addition and subtraction from left to right:

$10+16-1=26-1=25\neq 41$

This expression is not a correct option.

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