"how many even integers greater than two and less than twenty are equal in value to the sum of two prime numbers?"

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04-02-2018
Mathematics

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"how many even integers greater than two and less than twenty are equal in value to the sum of two prime numbers?"

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An atom of an element forms a 2+ ion. In which group on the Periodic Table could this element be located? (1) 1 (3) 13 (2) 2 (4) 17

Аноним Аноним · Answer 1 · 2018-02-04T14:25:19+01:00

Аноним Аноним

04-02-2018

The integers involved are 4 ,6, 8, 10, 12,14, 16 , 18

4 = 2 + 2 so 4 is one of the required integers.
6 = 3 + 3
8 = 3 + 5
10 = 3 + 7
12 = 5 + 7
14 = 3 + 11
16 = 3 + 13

They all are.
18 = 7 + 11

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