exam Maths Puzzle Numerical Ability

What is the formula for finding how many possible combinations you get?
1. If you have to select 4 people out of 6 people. What are the possible combinations

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exam Other Question

how do you find the b and solution of this equation? y=-3/4x I need to complete the following while combining all four operations of polynomials. what would this look like, could you give me the example? Thank you so much.

5x^2 + 28x - 10