Quiz Discussion

If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is

Course Name: Quantitative Aptitude

  • 1] 2
  • 2] 3
  • 3] 1
  • 4] 4
Solution
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# Quiz
1
Discuss

The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?

  • 1] -29
  • 2] -41
  • 3] -47
  • 4] -35
Solution
2
Discuss

The nth term of an A.P., the sum of whose n terms is Sn, is

  • 1] Sn + Sn - 1
  • 2] Sn - Sn - 1
  • 3] Sn + Sn + 1
  • 4] Sn - Sn + 1
Solution
3
Discuss

Find the nth term of the following sequence :

  • 1]

    5(10n - 1)

  • 2]

    5n(10n - 1)

  • 3]

    \(\frac{5}{9} \times \left( {{{10}^n} - 1} \right)\)

  • 4]

    \({\left( {\frac{5}{9}} \right)^n} \times \left( {{{10}^n} - 1} \right)\)

Solution
4
Discuss

If Sn denote the sum of the first n terms of an A.P. If S2n = 3Sn , then S3n : Sn is equal to

  • 1] 4
  • 2] 6
  • 3] 8
  • 4] 10
Solution
5
Discuss

Which term of the A.P. 24, 21, 18, ............ is the first negative term?

  • 1] 8th
  • 2] 9th
  • 3] 10th
  • 4] 12th
Solution
6
Discuss

The sum of the first and third term of an arithmetic progression is 12 and the product of first and second term is 24, then first term is

  • 1]

    4

  • 2]

    1

  • 3]

    8

  • 4]

    6

Solution
7
Discuss

The sum of first n odd natural numbers in

  • 1] 2n - 1
  • 2] 2n + 1
  • 3] n2
  • 4] n2 - 1
Solution
8
Discuss

If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :

  • 1] 20
  • 2] 32
  • 3] 38
  • 4] 40
Solution
9
Discuss

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

  • 1] 19
  • 2] 7
  • 3] 11
  • 4] 15
Solution
10
Discuss

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

  • 1] 5, 10, 15, 20
  • 2] 4, 10, 16, 22
  • 3] 3, 7, 11, 15
  • 4] None of these
Solution
# Quiz