exam Maths Puzzle Numerical Ability

Please could you tell me if an 88% DNA match has a good chance of being right or does percentages work differently with DNA

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exam Other Question

The difference between three times a number and another number is 2. Their sum is 6. Write a system of equations. Then solve for the numbers by graphing the equations. b^2 - ab - 6a^2 I was told to facrtor this problem completely and this is the answer that I came up with am I right?(b + 3a)(b - 2a)