A group of students is preparing for college entrance exams. It is estimated that 50% need help

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A group of students is preparing for college entrance exams. It is estimated that 50% need help with mathematics, 45% with English, and 25% with both. 

(a) Draw a Venn diagram representing these data. 

(b) Use this diagram to find the probability that a student needs help with mathematics, English, or both. 

(c) Solve part (b) symbolically by applying a probability formula.

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