Question

what is predecessor and successor

Answer 1

predecessor-it is the previous number of a given number
for eg- 3 is predecessor of 4

succesor-it is the number next number of a given number
for eg- 3 is the successor of 2

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Answer 2

predecessor is the previous number of a given number.
like predecessor of 8 is 7.
succesor is the number after the particular number.
succesor of 8 is 9.