What is the equation for Grubler‚Äö√Ñ√∂‚àö√ë‚àö¬•s criterion for plane mechanisms with constrained motion?$

What is the equation for Grubler‚Äö√Ñ√∂‚àö√ë‚àö�

1.	What is the equation for Grubler‚Äö√Ñ√∂‚àö√ë‚àö¬•s criterion for plane mechanisms with constrained motion?$
A.	3n-2j<sub>1</sub>-4=0
B.	3n-3j<sub>1</sub>-4=0
C.	3n+2j<sub>1</sub>+4=0
D.	3n+3j<sub>1</sub>+4=0
Answer» B. 3n-3j<sub>1</sub>-4=0