They are both equal yet answer comes different?

[hollow junco]

show your working

where you took 2^m common

you should get 2^m(1-2^(n-m)) if you take 2^m common

then you can proceed solving it

[hollow junco]

hmm

it looks like you should take 16x7 as product of 112

idk i dont get it

hmm

here the form is changed

before it was (2^(m-n)-1)

now it's the other way

hmm

im not sure bro