exam Maths Puzzle Numerical Ability

(2a - b)^-1 - (a + 2b)^-1
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(a + 2b)^-1
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(2a - b)^-1

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exam Other Question

find the average weight in pounds of a type of bird of your choice. Use the rational exponent equation L = 2.43 * W^0.3326 to estimate the wingspan L in feet of the bird that weigh The State Pick-3 lottery uses 27 balls numbered 1 to 9 (3 each). What is the probability that my ticket numbered "222" will win? Assme that the balls are not replaced after each selection.
A. 1/19683
B. 1/2925
C. 2/ 6561
D. 1/1