# 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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