The value of $\sqrt { 1 + 3 + 5 + 7 + ..... + 37}$  is
  • 18
  • 19
  • 20
  • 21
Find the least square number which is exactly divisible by 3, 4, 5, 6 and 8.
  • 900
  • 1800
  • 3600
  • 4000
$\sqrt {1234321} - \sqrt {12321}$ is
  • 100
  • 111
  • 1111
  • 10000
A perfect square number having n digits where n is even will have a square root with
  • n+1 digit
  • (n/2 + 1)digits
  • n/2 digits
  • None of the above
9216 students were sitting in a lecture room in such a manner that there were as many students in the row as there were rows in the lecture room. How many students were there in each row of the lecture room?
  • 94
  • 93
  • 92
  • 91
The unit digit of $109^2$ is
  • 1
  • 9
  • 7
  • 2
The sum of first n odd natural numbers is
  • $n^2 +1$
  • $2n^2$
  • $n^2$
  • $n^2 -1$
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