lim x->∞ ( 1 - 1 / X )X
(can be written also as )
= lim x->∞ e( X . log( 1 - 1/X ) )
( expansion of log ( 1 - 1/X) ) is -1*( 1/x + 1/2x2 + 1/3x3 ..... so on)
put this in equation we get
= lim x->∞ e( -X *(1/x + 1/2x^2 + 1/3x^3 ..... so on ) )
=lim x->∞ e( -1 *(1 + 1/2x + 1/3x^2 ..... so on ) )
applying limit we get
answer = e -1