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Basic maths

Basic concepts on maths, mostly up to class 10. This is the most important math knowledge used in almost all competitive exams.

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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