the predecessor of a+1 is 2 the successor of a - 1 is
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the successor of a - 1 is zero
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We observe that every whole number has its successor. The number which comes just before a particular number is called its predecessor. The predecessor of a whole number is one less than the given number. Clearly, the predecessor of 1 is 0; predecessor of 2 is 1; predecessor of 3 is 2 and so on.
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