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The number of ways in which 6 rings can be worn on the four fingers of one hand is:
a. 360
b. 4^6
c. 6C4
d. 6^4

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Ans B) option, you can put one ring in any of 4 fingers so it becomes 4*4*4*4*4*4.
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Case(1) When all rings are same

x1+x2+x3+x4=6

C(n+r-1,r) =9C

              =84

Case(2) All are distinct n u require all rings to worn

then C(n+r-1,r)*n! =9C6*6!

                                                     =60480

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