Explanation:

- The series appears to be formed by adding specific increments to each previous number.

- Start with 16, then successively add 18 to each previous number:

- 16 + 18 = 34

- 34 + 18 = 52

- 52 + 18 = 70 (Here, we find a discrepancy.)

- 70 + 18 = 88

- 88 + 18 = 106

- The number 72 doesn't fit this pattern; 70 is expected, not 72.

- Let's review the options:

- Option 1, 72: Discrepancy here because it breaks the consistent 18 increment pattern.

- Option 2, 34: Fits the pattern.

- Option 3, 88: Fits the pattern.

- Option 4, 52: Fits the pattern.

Your selected answer ("Option:1- 72") is correct.