Quiz Discussion

The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?

• 1] 34
• 2] 28
• 3] 25
• 4] 31

The first and last term of an A.P. is a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by $\frac{{{l^2} - {a^2}}}{{k - \left( {l + a} \right)}}$   then k = ?

• 1] S
• 2] 2S
• 3] 3S
• 4] None of these

The two geometric means between the number 1 and 64 are

• 1]

  8 and 16

• 2]

  2 and 16

• 3]

  4 and 8

• 4]

  4 and 16

If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then $\frac{{{S_1}}}{{{S_2}}}$

• 1]

  $\frac{{2n}}{{n + 1}}$

• 2]

  $\frac{n}{{n + 1}}$

• 3]

  $\frac{{n + 1}}{{2n}}$

• 4]

  $\frac{{n - 1}}{n}$

The sum of first five multiples of 3 is:

• 1]

  90

• 2]

  72

• 3]

  55

• 4]

  45