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https://conceptfirst.ai/senior-secondary/telangana-tsbie/class-11-science/mathematics/matrices/q/tsbie11-mathematics-2020-1a-q20-if-begin-vmatrix-a-a-2-1-a-3-b-b-2-1-b-3-c-c-2-1-c-3-end-vmatrix-0-and-begin-vmatrix-a-a-2-1-b-b-2-1-c-c-2-1-end-vmatrix-neq-0-then-show-that-abc-1-1uv9c9 2026-08-15T07:41:58.537Z weekly 0.6 https://conceptfirst.ai/senior-secondary/telangana-tsbie/class-11-science/mathematics/matrices/q/tsbie11-mathematics-2020-1a-q21-solve-the-system-of-equations-x-y-z-1-2x-2y-3z-6-x-4y-9z-3-by-using-cramers-rule-kmkv5u 2026-08-15T07:41:58.537Z weekly 0.6 https://conceptfirst.ai/senior-secondary/telangana-tsbie/class-11-science/mathematics/matrices/q/tsbie11-mathematics-2020-1a-q3-if-begin-bmatrix-x-1-2-5-y-0-z-1-7-1-0-a-5-end-bmatrix-begin-bmatrix-1-2-3-0-4-7-1-0-0-end-bmatrix-then-find-the-values-of-x-y-z-and-a-zl6gum 2026-08-15T11:58:30.258Z weekly 0.6 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