The number of integer values of a for which \( x^{2}-(a-1) x+3=0 \)...

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The number of integer values of a for which \( x^{2}-(a-1) x+3=0 \) has both roots positive and \( x^{2}+ \)
\( \mathrm{P} \) \( 3 x+6-a=0 \) has both roots negative is
(a) 0
(b) 1
(c) 2
(d) infinite
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