51. If n is an integer, then (n3 - n) is always divisible by :
52. How many numbers less than 1000 are multiples of both 10 and 13 ?
53. Which of the following is the smallest fraction ? $$\frac{8}{{25}},$$ $$\frac{7}{{23}},$$ $$\frac{{11}}{{23}},$$ $$\frac{{14}}{{53}}$$
54. How many digit required to write numbers from 1 to 50 ?
55. $$\left( {{2^{71}} + {2^{72}} + {2^{73}} + {2^{74}}} \right)$$ is divided by :
56. $$999\frac{{98}}{{99}} \times 99$$ is equal to :
57. The sum of four consecutive even numbers is 748, The smallest among them is -
58. $$1.\overline {27} $$ in the form $$\frac{{\text{p}}}{{\text{q}}}$$ is equal to :
59. Of the three numbers, the sum of the first two is 55, sum of the second and third is 65, and sum of third with thrice of the first is 110. The third number is -
60. If the digit in the unit and the ten's places of a two digit number are interchanged, a new number is formed, which is grater then the original number by 63. Suppose the digit in the unit place of the original number the x. Then all the possible value of x are -
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