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Study the given pattern carefully and select the number from among the given options that can replace the question mark (?) in
it.15
15 81 12
18 99 15
17 120 ?
13
11
9
16
- Observe the sequence: 15, 15, 81, 1218, 99, 1517, 120, ?
- The sequence alternates between two patterns, one for odd-positioned numbers and another for even-positioned numbers.
- Odd-position pattern: 15, 81, 99, 120.
- 15 (remains 15), 81 (9*9), 99 (11*9), 120 (12*10).
- Even-position pattern: 15, 1218, 1517, ?.
- 15 (remains 15), observe 1218 (100 + 1118 or 2 added to 1116), 1517 (which looks like 1100 + 417), follow the sum and sequence, expect 120 (begin at 1100).
- Thus, the missing number follows alternate pattern completion.
Correct Answer: Option 1, 13
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