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How to solve similar problems in a few seconds, Profit and loss problem 2, Domain modeling

thumb_How to solve in a few seconds profit and loss problem 2, Domain modeling

A man sells two wrist watches one at a profit of 50% and another at a loss of 50%, but each at a same selling price of Rs.300. The net profit or loss is...This type of problem can be solved in a few seconds if you can form its Domain model by Abstraction and Repeated solving of similar problems with controlled variation...

How to solve in a few steps, Profit and loss problem 1

thumb_How to solve in a few steps profit and loss problem 1

A man sells two wrist watches one at a profit of 30% and another at a loss of 30%, but each at a same selling price of Rs.400. The net profit or loss is...This type of problem can be solved following clear steps based on basic concepts of profit and loss only. This is conventional approach of problem solving...

Permutation and combination

thumb_permutation and combination

Permutation and combination deal with choice and arrangement of a set of objects out of a second set of objects. Permutation deals with such questions as, how many ways can the three letters a, b and c be arranged? In each such permutation or arrangement, ordering is important. On the other hand, Combination deals with such questions as, how many ways can you choose a captain and vice-captain out of a cricket team of 11 players? In a combination, ordering of the elements chosen is not important...

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