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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?

 Feb 2, 2022
 #1
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The common 'd' is 4     125 + 4 = 129       +4 = 133        +4 = 137    etc

 

125, 129, 133, 137, 141, 145

 Feb 2, 2022

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