# Aptitude  Number series  Practice Q&A

71. Which one of the following numbers is completely divisible by 99?

 3572404 135792 913464 114345

72. The sum of how many terms of the series 6 + 12 + 18 + 24 + ... is 1800 ?

 16 24 20 18

73. $\left(51+ 52 + 53 + ... + 100\right)$ = ?

 2525 2975 3225 3775

74. 1904 x 1904 = ?

 3654316 3632646 3625216 3623436

75. What is the unit digit in(795 - 358)?

 0 4 6 7

76. 1 + 2 + 3 + … + 40 = ?

 760 780 800 820

77. What is sum of first 17 natural numbers?

 160 193 153 148

78. What is the sum of the cubes of first 12 numbers?

 6084 4068 8046 8064

79. a + (a + 1) + (a + 2) + (a + 3) = x. Which of the following matches this equation?

 a = 1; x = 9 a = 0; x = 3 a = 2; x = 6 a = 1; x = 10

80. Find the sum of the cubes of first 25 natural numbers.

 110625 105625 100625 115625