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|(a+1, a+2, a+p), (a+2, a+3, a+q) ,(a+3,...

|(a+1, a+2, a+p), (a+2, a+3, a+q) ,(a+3, a+4, a+r)|=0\n, তারপর p , qr আছে\n(A) AP\n(B) GP\n(...

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