Quiz Discussion

If 18, a, b - 3 are in A.P. then a + b =

Course Name: Quantitative Aptitude

  • 1] 19
  • 2] 7
  • 3] 11
  • 4] 15
Solution
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# Quiz
1
Discuss

Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn – k Sn-1 + Sn-2 then k =

  • 1]

    1

  • 2]

    2

  • 3]

    3

  • 4]

    4

Solution
2
Discuss

What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

  • 1] 219
  • 2] 279
  • 3] 231
  • 4] 137
Solution
3
Discuss

If the sum of n terms of an A.P. is 3n2 + 5n then which of its terms is 164 ?

  • 1] 26th
  • 2] 27th
  • 3] 28th
  • 4] None of these
Solution
4
Discuss

The sum of first n odd natural numbers in

  • 1] 2n - 1
  • 2] 2n + 1
  • 3] n2
  • 4] n2 - 1
Solution
5
Discuss

In an A.P., if d = -4, n = 7, an = 4, then a is

  • 1] 6
  • 2] 7
  • 3] 20
  • 4] 28
Solution
6
Discuss

The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?

  • 1]

    56

  • 2]

    62

  • 3]

    65

  • 4]

    69

Solution
7
Discuss

If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is

  • 1] -2
  • 2] 3
  • 3] -3
  • 4] 6
Solution
8
Discuss

Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is

  • 1] 11
  • 2] 3
  • 3] 8
  • 4] 5
Solution
9
Discuss

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
Solution
10
Discuss

Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then

  • 1]

    a = 7/4, r = 3/7

  • 2]

    a = 2, r = 3/8

  • 3]

    a = 3, r = 1/4

  • 4]

    a = 3/2, r = ½

Solution
# Quiz