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The fourth term of an Arithmetic Progression (A.P) is 37 and the first term is...

Mathematics
WAEC 2019

The fourth term of an Arithmetic Progression (A.P) is 37 and the first term is -20. Find the common difference.
 

  • A. 3    
  • B. 57  
  • C.  19    
  • D. 17
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Correct Answer: Option C
Explanation

a + 3d = 37

-20 + 3d = 37 

3d = 37 + 20 = 57

d = \(\frac{57}{3}\) 

= 19

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