L&T Company Numerical Ability Permutation and Combination

A student is to answer 9 out of 12 questions in an examination such that he must choose at least 5 from the first six questions. The number of choices available to him is

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L&T Other Question

6 men and 10 boys finish a piece of work in 4 days, 5 men and 6 boys do it in 6
days. The ratio between the efficiencies of a man and boy is?
A certain factory employed 600 men and 400 women and the average wage was
Rs. 25.50 per day. If a woman got Rs. 5 less than a man, then what are their daily
wages?