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Progressions for CSAT: AP, GP and HP Explained
Arithmetic, geometric and harmonic progressions from first principles: formulae, sum shortcuts, bouncing-ball and price puzzles, and real UPSC PYQs solved step by step.
Permutation and Combination for CSAT: PYQs Explained
Permutations, combinations and counting rules explained from zero, then applied to real UPSC PYQs: paintings, roads, handshakes, task assignments and selection puzzles.
Geometry and Mensuration for CSAT: PYQs Explained
CSAT geometry is about counting figures, tiling shapes and rolling wheels, not long calculations. Learn the formulae, the three question patterns, and solve real UPSC PYQs.