QID: 21- If 3x + 5y + 7z = 49 and 9x + 8y + 21z = 126, then what is the value of y?

यदि 3x + 5y + 7z = 49 तथा 9x + 8y + 21z = 126 है, तो Y का मान क्या है ?

A) 4 B) 2 C) 3 D) 5

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