redox

In this question I was able to find out the number of transferred electrons
N- +6
Cr- (-6)
Cuz it's a disproportionation reaction, the nfactor should be:-
6*6/ 6+6 = 3

But the answer is M/6 and not M/3.
Where did I go wrong?

(I am presuming net change liya hai but then again we have a formula for disp, why not use it?)
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