यदि a तथा b दो वास्तविक संख्याएँ ऐसी हों कि ab=0.तो....
(a) a=0तथा b=0
(b) a = 0 अथवा b = 0 या दोनों में से प्रत्येक शून्य
(c) a=0तथा b is not=0
(d) b=0तथा a is not = 0
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a, b, c, d San Ho sakta hai
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