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Explanation:

Aditya, Vedus and Yuvraj do (1/6), (1/9) and (1/12) of the work respectively in a week. Let the total time taken to complete the work be n weeks.

Then,

216 + (n - 1)19 + n112 = 1

∴ 12+4(n-1)+3n36 = 1

∴ n = 4

Hence, option (a).

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