7 and -6
1 + 2 + 4 + 5 + 10 + 20 = 42
Hint: review your multiplication table-- does not 42 ring a bell? What times what makes 42? Is their sum 13? ?? bingo!!
42 has three prime factors: 2, 3 and 7
42=2*3*7 2+3+7 = 12
2 + 5 + 10 + 25 = 42
The factors of 7 are 1, 7. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42.
It is only possible to have one even prime factor of any number - as there is only one even prime number, 2. The sum of these is therefore 2.
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Factors of 42: 1, 2, 3, 6, 7, 14, 21, and 42. Factors of 49: 1, 7, and 49.
The factors of 25 are: 1, 5, 25The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
The factors of 9 are 1, 3, and 9. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 31 are: 1, 31