Sequence and series word problems involve real-world applications and pattern recognition. Types: (1) Finance: EMI, compound interest (geometric series); (2) Bacteria growth: Doubling at intervals (exponential); (3) Salary progression: Arithmetic or geometric increases; (4) Loan repayment: Annuity calculations; (5) Ladder problems: Sequences of heights/distances. Solving approach: (1) Identify sequence type (AP/GP/HP); (2) Extract parameters; (3) Use appropriate formula; (4) Interpret answer in context. Example: Salary increases by 5% yearly. Starting 10,000. After 5 years: GP with a=10000, r=1.05, n=5. A₅ = 10000(1.05)⁴ ≈ 12155. Exam tip: Read carefully for rate type (absolute vs percentage). Distinguish single amount from series. Verify answers for reasonableness.