Refer to the following series and answer the question that follows. Counting to be done from left to right. (Note: All numbers are single-digit numbers only.) (Left) 8 3 6 1 5 4 7 9 2 3 8 5 1 4 6 9 2 7 3 8 5 1 4 6 (Right) How many odd numbers are there, each of which is immediately preceded by an even number and immediately followed by an even number?
3
Scan the series 8 3 6 1 5 4 7 9 2 3 8 5 1 4 6 9 2 7 3 8 5 1 4 6 from left to right.
For each odd digit, check whether the digits immediately before and after it are both even.
8 3 6 — odd 3 has 8 (even) before and 6 (even) after — qualifies.
2 3 8 — odd 3 has 2 (even) before and 8 (even) after — qualifies.
6 9 2 — odd 9 has 6 (even) before and 2 (even) after — qualifies.
No other odd digit has even neighbours on both sides.
Hence, the count is three.
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Choose the option which completes the given figure series.
Select the correct option that will fill in the blank and complete the series.
18, 36, 108, 432, 2160, .............Select the correct option that will fill in the blank and complete the series.
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Select the correct option that will fill in the blank and complete the series.
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