Explanation:

- The given series is: 15, 30, 33, ?, 137, 822.

- Let's analyze the pattern:

- Start with 15.

- 15 multiplied by 2 gives 30.

- 30 adds 3 to give 33.

- To identify the missing number, observe existing numbers.

- 33 probably follows a similar pattern with addition or multiplication.

- After 33, a common factor or sequence might apply consistently.

- If the sequence is alternately multiplying by a number and adding one:

- 33 multiplied by 3 equals 99.

- 99 fits the position logically when examined with the rest of the sequence.

- Now, check available options: 126, 132, 128, 130.

- None of them represent 99; rechecking might be required if assuming continuity.

- However, none of these numbers consistently fit based on consistent arithmetic reasoning explored.

Given the choices and a possible series understanding, the correct number should be:

- 130

?? Check the sequence method to confirm alternation identification if necessary.

Option 4: 130

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