exam Maths Puzzle Numerical Ability

ISBN (very important): 0-07-822880-8
Textbook title (optional): Glencoe Geometry Integration,Applications,Connections
Edition number: PG.226
Chapter number: Chapt.4 Identifying

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exam Other Question

Events W,X,Y and Z are independent, and P(W)= 0.75, P(X)= 0.25, P(Y)= 0.2, and P(Z)= 0.3. Find P(W and X). please help me to fin the answer of this question : ab+a-b=2001, find the value of a and b. if a and b are a real number.