MBA Exam

How many 5 digit nos contain exactly two 7's in them?

1) 4268
2) 6804
3) 2340
4) 1269

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MBA Other Question
Next number of this series? 1,4,108,294,?Thank you

There are 3 urns A, B and C, A contains 4 red balls and 3 black balls. Urn B contains 5 red balls and 4 black balls. Urn C contains 4 red balls and 4 black balls. One ball is drawn from each of these urns. What is the probability that the 3 balls drawn consist of 2 red balls and a black ball ? a) 17/42 b) 25/42 c) 19/42 d) 23/42

1) a
2) b
3) c
4) d