question#7
take your time

Question

question#7 
take your time

anonymous · Answer

after express $$2^{29}$$ there are 9 different digits
which number doen't exist in these 9 digits (solve without using calculator)

credit: passer-by

anonymous · Answer

what do you mean which number ?

anonymous · Answer

1-9 which one doesn't exist in those 9 digits

anonymous · Answer

lol 4.

anonymous · Answer

no calculator!!! LOL

binary3i · Answer

7 or 9

anonymous · Answer

I didn't used calculator, I know what is $ 2^{14} $ ,$ 2^{15} $ and one line multiplication.

anonymous · Answer

oh sorry for misunderstanding

anonymous · Answer

but i check by using calculator LOL 
4 is CORRECT!

anonymous · Answer

you want me try it analytically ?

anonymous · Answer

plz do

anonymous · Answer

But your problem is not stated correctly , the actually problem that  I know is of the form:

$ 2^{29}$, expressed in base 10, is a nine-digit number. All nine of its digits are different. Find the digit that is missing without explicitly calculating $ 2^{29} $

anonymous · Answer

oh I see. it's problem translating

anonymous · Answer

Haha.. this question has got me curious. Could someone please explain how to get the answer?