Find the missing numbers 3,,,12,,21

Question

Find the missing numbers 3,__,__,12__,__,21

asked Jan 21, 2018 72.9k views

2 Answers

Savagent · Answer 1 · 2018-01-23T23:54:34+0000

theres a differnece of 9 between 12 and 3 and also between 12 and 21

looks like an arithmetic series with common difference = 3

so the ful series is
3,6,9,12,15,18,21

Find the missing numbers 3,,,12,,21

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