arithmetic-&-geometric-progressions

Arithmetic & Geometric Progressions

Arithmetic Progression, Geometric Progression, Harmonic Progression: Definition, Arithmetic Progression Formula, Geometric Progression Formula, Solved Problems

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Online Aptitude Questions with Answers on Arithmetic & Geometric Progressions

Q16. **Find the sum of the first 12 odd natural numbers.**

  1.  280
  2.  180
  3.  320
  4.  144

Solution : 144
Q17. **Find the sum: 13 + 15 + 17 + ..... + 47**

  1.  120
  2.  230
  3.  220
  4.  540

Solution : 540

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Q18. **How many terms of the series 230 + 227 + 224 + .... make a sum of 4200 ?**

  1.  20
  2.  21
  3.  32
  4.  43

Solution : 21
Q19. **Find three numbers in A.P such that their sum is 21 and the sum of their squares is 179**

  1.  3,5,7
  2.  5,9,13
  3.  6,13,20
  4.  3,7,11

Solution : 3,7,11

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Q20. **In an A.P., the 7th and 9th terms are 16 and 20 respectively. Find the nth term**

  1.  2(n+1)
  2.  2(n+2)
  3.  2n
  4.  n+4

Solution : 2(n+1)
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