The table below shows the results of a survey that asked 2857 people whether they are involved in any type of charity work. A person is selected at random from the sample.                   Frequently          Occasionally           Not at all          Total Male          221    451            795    1467 Female     206    440            744    1390 Total         427    891           1539    2857 ​Find the probability that the person is frequently or occasionally involved in charity work.   A (being frequently involved or being occasionally involved)= B (being occasionally involved in charity work)=

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