exam Maths Puzzle Numerical Ability

how would i do this? Indicate the formula for the following conditions
C(n,r)=

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exam Other Question

name the ordered pairs for p,q,and r. multiply each x- and y- coordinate by -1 to get three new ordered pairs Solve

3/8x - 1/2y = 1
0.2x + 0.6y = 4