71.
A number is divisible by 11 if the difference between the sums of the digit in odd even places respectively is :

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

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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