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1 Answer

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$12 + 8 + 0*10 = 20$


$20 + 10 + 1*10 = 40$

 

$40 + 12 + 2*10 = 72$

 

$72 + 14 + 3*10 = 116$

 

$116 + 16 + 4*10 = 172$

 

$172 + 18 + 5*10 = 240$

 

Hence,Next number will be $240$.

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