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What is the next number in the series?

$12$     $35$      $81$      $173$      $357$ _______.

one way is this to getting answer as $725$ bcz their diffrence is each time double

and other way is $12\times 2+11=35$

$35\times 2+11=81$

$81\times 2+11=173$

so mul by $2$ and add $11$ and lastly we do $357\times 2+11= 725$
by

### 1 comment

Yes Ans is 725 but with double of the previous number 11 is added each time in it. :)

### 1 comment

@ Prateek kumar last one should be 368 instead of 364.