Question

The sum of predecessor and successor of any number will be ________.

• A. zero
• B. two
• C. same as the number itself
• D. twice the number.

Answer 1

The correct option is D twice the number.

Predecessor of any number= number - 1
Successor of any number = number + 1.

Sum of predecessor and successor = number - 1 + number + 1
= 2(number).

Therefore, the sum of predecessor and successor of any number will be twice that of the number.