11. Find the unit digit in the product : $${\left( {4387} \right)^{245}}$$ $$ \times {\left( {621} \right)^{72}}$$
12. Which of the following is the largest fraction ? $${\text{ }}\frac{6}{7},$$ $$\frac{5}{6},$$ $$\frac{7}{8},$$ $$\frac{4}{5}$$
13. Largest fraction among $$\frac{2}{5},$$ $$\frac{5}{6},$$ $$\frac{{11}}{{15}}$$ and $$\frac{7}{8}$$ is :
14. If 4x2 - 12x + k is a perfect square. then the value of k is ?
15. A number consists of two digits such that the digit in the ten's place is less by 2 than the digit in the unit place. Three times the number added to $$\frac{6}{7}$$ times the number obtained by reversing digits equals 108. The sum of digits in the number is -
16. The sum of the numerator and denominator of a positive fraction is 11. If 2 is added to both numerator and denominator, the fraction is increased by $$\frac{1}{{24}}$$. The difference of numerator and denominator of the fraction is -
17. The digit in unit's place of the number (1570)2 + (1571)2 + (1572)2 + (1573)2 is :
18. A number which divided by 192 gives a remainder of 54. What remainder would be obtained on dividing the same number by 16 ?
19. What will be the unit digit in the 7105 ?
20. In an examination, a student scores 4 marks for every correct answer and losses 1 mark for every wrong answer. A student attempted all the 200 questions and scored 200 marks. The number of questions, he answered correctly was -
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