13. For how many three digit numbers (100 to 999) is the sum of the digits even? (For example, 343 has an even sum of digits: 3 +4+3 = 10 which is even.) Find the answer and explain why it is correct in at least two different ways.

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A: We can answer the question as below.

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Q: le and how you solved, thank you.

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A: To solve the integral ∫0∞ ∫0∞ ex2+y2dydx

Q: please what if it was from the left endpoints howould i solve that

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Q: this is incorrect, please let me know if you can fix it.

A: Total students= 16  2 A , 4B , 4C , 4D , 2F Formula :  Permutation with identical objects :  = N! (…

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Q: i need this answer for with four decimals.    Can you please help?

A: We can solve this as follows:

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Q: Just solve the third one. The other two are right

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