Question

The sum of successor and predecessor of 9 is

Answer 1

Given :

Successor and predecessor of 9

To Find :

The sum of successor and predecessor of 9

Solution :

Successor of 9 = 10 (number which comes after 9)

Predecessor of 9 = 8 (number which comes before 9)

Sum of predecessor and successor = 10 + 8

                                                            = 18 (Answer)

Answer 2

The sum of successor and predecessor of 9 is 18

Given :

The successor and predecessor of 9

To find :

The sum

Concept :

We know for any given number N , the successor is obtained by adding 1 with the number and the predecessor is obtained subtracting 1 from the nu

The successor of N = N + 1

The predecessor of N = N - 1

Solution :

Step 1 of 3 :

Find successor of 9

The successor of 9

= 9 + 1

= 10

Step 2 of 3 :

Find predecessor of 9

The predecessor of 9

= 9 - 1

= 8

Step 3 of 3 :

Find the sum

The sum of successor and predecessor of 9

= 10 + 8

= 18

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