If 3*4 = 21 ; 4*5 = 36 ; 5*6 = 55, then find 6*7. – McqOptions

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1.	If 34 = 21 ; 45 = 36 ; 56 = 55, then find 67.
A.	91
B.	67
C.	42
D.	78
Answer» E.

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