MBA Exam

No of ways of distributing n identical things among r persons when each person may get any no. of things ?Plz explain the logic .........

1) (n+r-1)C(r-1)

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MBA Other Question

A company manufactures pencils in boxes of 6, 9, and 20. The boxes are sealed and the pencils cannot be sold loose. What is the largest number of pencils that a wholesaler cannot purchase using some combination of these boxes?

1) 43
2) 99
3) 199
4) Indeterminate
There is a trapezium ABCD such that the sides AB and CD are parallel to each other. The diagonals AC and BD intersect at O. The area of the triangle COD is 10 square cm and the area of the triangle AOB is 40 square cm. Find the area of the trapezium.P.s. Please post the approach as well.

1) 90
2) 100
3) 250
4) 120