The *n*th term of an infinite series is given by:-
$t_n = nx^{n-1},$
Where $t_n$ represents the *n*th term

And it is given that:-
$\sum_{n=1}^{\infty} nx^{n-1} = 4,$
Where x is a real number lying between 0 and 1.

Calculate the value of x.

Note:-Since numbers being added are infinite so sum of above sequance is not actualy 4, if **t n**