Q: What does ''write 26 as the sum of two prime numbers in three different ways'' mean?

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2x21x11

Three ways (I think).

2+3,11+3,3+17

231 = 3 x 7 x 11

Numbers divisible by 1 & number itself are called prime numbers. These numbers also have the property to be odd numbers.

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2x21x11

Three ways (I think).

2+3,11+3,3+17

It means write down three pairs of numbers that are relatively prime like 4 and 9, 5 and 6, 13 and 25

A number as a product of prime numbers would be "x".

231 = 3 x 7 x 11

Numbers divisible by 1 & number itself are called prime numbers. These numbers also have the property to be odd numbers.

567576657675756765

Prime factorization of 27 = 3x3x3

That's called the prime factorization.

You can't write that as the sum of two prime numbers. Note: Goldbach's Conjecture (for expressing numbers as the sum of two prime numbers) applies to EVEN numbers.

Its impossible, there are only 5 single digit numbers that are not prime