If X and Y are prime numbers, then which of the following cannot be the the sum of X and Y?

If X and Y are prime numbers, then which of the following cannot be the the sum of X and Y? ?

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Best Answer Explained in Below-:

Here, the highest total is 23. Now, Prime numbers upto 23 = 2, 3, 5, 7, 11, 13, 17, 19, 23. Here, 2 + 3 = 5; 2 + 11 = 13; 5 + 11 = 16; But, no pair of numbers from these numbers adds up to 23.

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If X and Y are prime numbers, then which of the following cannot be the the sum of X and Y? ?

A motorcycle costs Tk. 2500 when it is brand new. At the end of each year it is worth 4/5 of what it was at the beginning of the year. What is the motorcycle worth when it is 3 years old?

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