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There are n white and n black balls marked 1, 2, 3, ...... n. The number of ways in which we can arrange these balls in ...
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What is the number of ways in which an examiner can assign 10 marks to 4 questions, giving not less than 2 marks to any ...
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Five letter words, having distinct letters, are to be constructed using the letters of the word 'EQUATION' so that each ...
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If the total number of m-element subsets of the set A = {a1, a2, ..., an} is k times the number of m element subsets con...
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In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. I...
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$${}^{15}{C_3} + {}^{15}{C_5} + \,\,......\,\, + {}^{15}{C_{15}} = $$
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The number of diagonals in a polygon is 20. The number of sides of the polygon is
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If $${}^n{C_4}$$, $${}^n{C_5}$$ and $${}^n{C_6}$$ are in A.P., then n is
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If $${}^{n - 1}{C_3} + {}^{n - 1}{C_4} > {}^n{C_3}$$, then n is just greater than integer
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The number of permutations by taking all letters and keeping the vowels of the word COMBINE in the odd places is
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A polygon has 44 diagonals. The number of the sides is
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The number of ways four boys can be seated around a round table in four chairs of different colours is
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How many odd numbers of six significant digits can be formed with the digits 0, 1, 2, 5, 6, 7 when no digit is repeated?...
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Out of 8 given points, 3 are collinear. How many different straight lines can be drawn by joining any two points from th...
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How many triangles can be formed by joining 6 points lying on a circle?
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