MBA Exam

The odds in favor of standing first of 3 students Amit, Vikas & Vivek appearing at an examination are 1:2, 2:5 ans 1:7 respectively. What is the probability that either of them will stand first( assume that a tie int he first place is not possible). plzz help on this guys...

1) 168/178
2) 122/168
3) 5/168
4) 125/168

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MBA Other Question
How many 6 digit no. contain 4 diff digits ?plz... explain the process.

1) 4536
2) 294840
3) 191520
4) non
 The first two terms of a G.P are the same as that of an A.P. If the common difference of A.P. is 300 and the third term of the G.P is 7500 more than the third term of the A.P, then find the second term of the G.P?

1) 12
2) 120
3) 24
4) 36