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The first term of an arithmetic progression is 8. If the tenth term is double the second term, the common difference is...

 Mar 21, 2020
 #1
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8 +d   is the second term

 

8+9d  is the 10th term and is equal to  2 x (8+d)

 

8+9d =2(8+d)

8+9d = 16 + 2d

7d = 8

d = 8/7

 Mar 21, 2020

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