hard · GMAT Quant
A network security analyst is monitoring a sequence of 4 data pulses, where each pulse is tagged as either High-Priority (H) or Low-Priority (L). A sequence is considered an 'anomaly' if it meets exactly one of the following two criteria:
(i) The sequence contains exactly three H pulses.
(ii) No two L pulses appear consecutively.
How many distinct sequences of 4 pulses are classified as anomalies?
- 5
- 4
- 6
- 9
- 12
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