Question

What is the meaning of predecessor

Answer 1

Predecessor has many meanings.It is generally something which comes before the current thing like i can say that your grandfather is your predecessor which means that your grandfather came to this earth before you/he was born before you/you came later on.
In maths it means a number which comes before a number like-
7-1=6, 6 is the predecessor of 7.
Generally it is something that is replaced by something else or is followed by something else.

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Answer 2

A number before

Or - 1