50. The sum of even numbers between 1 and 31 is :
51. (51 + 52 + 53 +????+ 100) = ?
52. The smallest prime numbers is :
53. The sum of first five prime number is :
54. How many prime numbers are less than 50 ?
55. Which of the following is a prime number ?
56. Which one of the following is not a prime number ?
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