Start the test Question no. 1 If the n th term of an A.P. is 2n-1, what is the sum of upto n terms ?   n 2   n 2 -1   n 2 +1   0.5n(n+1) Question no. 2 If the three observation are 3,-6 and -6. Then what is their harmonic mean?   0   -3   -0.5   ∞ Question no. 3 If the number of terms of an A.P. is (2n+1), then what is the ratio of the sum of odd terms to the even terms?   n/(n+1)   n 2 /(n+1)   (n+1)/n   (n+1)/2n Question no. 4 If the sum of terms of an A.P. is n 2 -2n , then what is the n th term?   3n-n 2   2n-3   2n+3   2n-5 Question no. 5 If the AM and GM of two numbers are 5 and 4 respectively, then what is the HM of those numbers?   5/4   16/5   9/2   9 Question no. 6 If x 2 , y 2 , z 2 are in A.P., then y+z, z+x, x+y are in   AP   GP   HP   None of these Question no. ...