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Number Patterns and Sequences Explained — Fibonacci, Catalan, Triangular for Interviews [LC 96, Google, Meta]
Recognising classical number sequences — Fibonacci, Catalan, triangular, Pascal-derived — is the difference between a 30-minute brute force and a 5-minute closed form. Master the recurrences, generating functions, and combinatorial interpretations every interviewer expects you to know.
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