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Quantitative Aptitude

PROGRESSIONS MCQs

Total Questions : 42 | Page 1 of 5 pages
Question 1. If Sn denotes the sum of the first r terms of an A.P. Then, S3n : (S2n – Sn) is
  1.    n
  2.    3n
  3.    3
  4.    None of these
 Discuss Question
Answer: Option C. -> 3
Question 2. If $$\frac{1}{{x + 2}},$$  $$\frac{1}{{x + 3}},$$  $$\frac{1}{{x + 5}}$$   are in A.P. then x = ?
  1.    5
  2.    3
  3.    1
  4.    2
 Discuss Question
Answer: Option C. -> 1
Question 3. If $$\frac{{5 + 9 + 13 + ...\,{\text{to}}\,n\,{\text{terms}}}}{{7 + 9 + 11 + ...\,{\text{to}}\,\left( {n + 1} \right)\,{\text{terms}}}}$$       $$ = \frac{{17}}{{16}},$$  then n = ?
  1.    8
  2.    7
  3.    10
  4.    11
 Discuss Question
Answer: Option B. -> 7
Question 4. If the first term of an A.P. is a and nth term is b, then its common difference is
  1.    $$\frac{{b - a}}{{n + 1}}$$
  2.    $$\frac{{b - a}}{{n - 1}}$$
  3.    $$\frac{{b - a}}{n}$$
  4.    $$\frac{{b + a}}{{n - 1}}$$
 Discuss Question
Answer: Option B. -> $$\frac{{b - a}}{{n - 1}}$$
Question 5. The common difference of the A.P. is $$\frac{1}{{2q}},$$ $$\frac{{1 - 2q}}{{2q}},$$  $$\frac{{1 - 4q}}{{2q}},$$  . . . . is
  1.    -1
  2.    1
  3.    q
  4.    2q
 Discuss Question
Answer: Option A. -> -1
Question 6. The first three terms of an A.P. respectively are 3y – 1, 3y + 5 and 5y + 1. Then, y equals
  1.    -3
  2.    4
  3.    5
  4.    2
 Discuss Question
Answer: Option C. -> 5
Question 7. If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is
  1.    87
  2.    88
  3.    89
  4.    90
 Discuss Question
Answer: Option C. -> 89
Question 8. If the sum of it terms of an A.P. is 2n2 + 5n, then its nth term is
  1.    4n - 3
  2.    3n - 4
  3.    4n + 3
  4.    3n + 4
 Discuss Question
Answer: Option C. -> 4n + 3
Question 9. In an AP, Sp = q, Sq = p and S denotes the sum of first r terms. Then, Sp+q is equal to
  1.    0
  2.    – (p + q)
  3.    p + q
  4.    pq
 Discuss Question
Answer: Option C. -> p + q
Question 10. If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =
  1.    $$\frac{1}{n}$$
  2.    $$\frac{{n - 1}}{n}$$
  3.    $$\frac{{n + 1}}{{2n}}$$
  4.    $$\frac{{n + 1}}{n}$$
 Discuss Question
Answer: Option D. -> $$\frac{{n + 1}}{n}$$

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