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If ( 3x -1 )^7 = a(7) x^7 + a(6) x^6 +...

If `( 3x -1 )^7 = a_(7) x^7 + a_(6) x^6 + a_(5) x^5 + --- + a_(1) x + a_(0)` then `a_(7) + a_(6) + a_(5) --- a_(1) + a_(0) `is equal to
( a ) 0
( b ) 1
( c ) 128
( d ) 64

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