Archetype Sub-90 Dry-Wipe Invariant (Coupled Arithmetic & Geometric Progressions and Sum to Infinity (S∞)): Use the mean identities directly: three terms x, y, z are in AP iff 2y = x + z, and in GP iff y² = xz. Always verify |r| < 1 if S(infinity) is mentioned.
sub90 ESATARCH-MM-03: Coupled Arithmetic & Geometric Progressions and Sum to Infinity (S∞)Mathematics 2
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SUB-90 ZONE (<45S)
0.0s45s Sub-9090s ESAT Budget150s Classroom
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Question 1 of 39 • 90s Target
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Mathematics 2•ARCH-MM-03•Standard 5-Option
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