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Find the missing numbers : 14, 15, 12, 16, 9, 18, 4, 21, ?

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Find the missing numbers :

14, 15, 12, 16, 9, 18, 4, 21, ?
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The sequence is a combination of two series. 

I 14, 12, 9, 4, (.....) and 

II 15, 16, 18, 21 

The pattern followed in I is -2, -3, -5, ..... 

∴ missing number = 4 - 7 = - 3

Ans. - 3 

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