TCS Company Numerical Ability Permutation and Combination

In G-20 meeting there were 20 people representing their own country.All the representative sat around a circular table.Find the number of ways in which we can arrange them around a circular table so that there is exactly one person between two representatives namely Manmohan and Musharraf.
option
i. 2x(17!)
ii. 2x(18!)
iii. (3!)X(18!)
iv. (17!)

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TCS Other Question

A sum of rs 3000 is distributed amongst A, B, and C. A gets 2/3 of what B and C got together and c gets 1/3 of what A and B got together, C's share is? How many Numbers can be formed with digits 2,4,6,8 without repetition?
option
i. 124
ii. 256
iii. 64
iv. 84