19. यदि + y+ 2 = 4, 2+ y + 2 = 6
और 7-1+ y-1 + 2-1 = 1 जहाँ x, 3, 2 में
से कोई भी शून्य नहीं है, तो xyz का मान है
(a)1 (b) 2 (c)4 (d) 5
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1 is the answer of your question
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