If 1 is a root of both the equation \( a x^{2}+a x+3=0 \) and \( x^{2}+x+b=0 \), then \( a b= \) W

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If 1 is a root of both the equation \( a x^{2}+a x+3=0 \) and \( x^{2}+x+b=0 \), then \( a b= \)
W
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