8,21,13,31 प्रत्येक में क्या जोड़� – McqOptions

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1.	8,21,13,31 प्रत्येक में क्या जोड़ा जाये कि नई संख्यायें समानुपाती हों ?
A.	1
B.	6
C.	5
D.	9
Answer» D. 9

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