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In each blank below a single digit is inserted such that the following six three-digit numbers in this order, form an arithmetic sequence:

 

125, 129, 1_ _, 1_ _, 1_ _, 1_ _

 

What are the missing digit?

 Oct 25, 2020
 #1
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What is the difference between the first and the second term?

 

129  -  125 = 4 - is the common difference. Then just add 4 to each term.

 

125, 129, 133, 137, 141, 145......etc.

 Oct 25, 2020

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