Question

Find the missing numbers. 10, 20, 10,9,21, 11,8, 22, 12. ...
(1) 5
(2) 7
(3) 8
(4) 11​

Answer 1

Pattern is combination of three series

10,9,8,7,....., and 20,21,22,23,.....and 10,11,12,13,.....

∴ Missing number =7

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