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If the coefficients of x 7 in 11 2 bx 2 1 ax        and x –7 in 11 2 bx 3 1 – ax       are equal, then

1. 729ab = 32
2. 32ab = 729
3. 64ab = 243
4. 243ab = 64

Correct answer: 729ab = 32

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