11. Find the sum of first 70 odd numbers 


12. Find the sum of all odd number upto 250. 


13. What is the units place digit in the expansion of (249)^{64} 


14. What is the unit place digit in (24)^{13} x (13)^{4} x (21)^{16} 


15. In a division, divident is 689, divisior is 36 and quotient is 19. Find the remainder. 


16. Find the number of different prime factors of 2400 


17. What least number must be added to 4725 to make a perfect square. 


18. Find the number of divisors of 80 


19. Find the number of divisor of 248 other than unity and itself 


20. How many digits are used to number a book containg 300 pages. 


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