71. A number is divisible by 11 if the difference between the sums of the digit in odd even places respectively is :
72. 6 × 3 (3 - 1) is equal to :
73. 325325 is a six-digit number. It is divisible by :
74. If a and b are two numbers such that ab = 0, then -
75. The number of zeros at the end of 60! is :
76. In a division problem, the divisor is 7 times of quotient and 5 times of remainder. If the dividend is 6 times of remainder, then the quotient is equal to :
77. What should be the maximum value of q in the following equation?
5P9 - 7Q2 + 9R6 = 823
5P9 - 7Q2 + 9R6 = 823
78. Let n be a natural number such that $$\frac{1}{2}$$ + $$\frac{1}{3}$$ + $$\frac{1}{7}$$ + $$\frac{1}{n}$$ is also a natural number. Which of the following statements is not true ?
79. If 37 X 3 is a four-digit natural number divisible by 7, then the place marked as X must have the value :
80. If m and n are positive integers, then the digit in the unit's place of 5n + 6m is always :
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