How to add 2 to the 100th power of 2 plus 2 to the 99th power of 2 plus 2 to the 98th power of 2

How to add 2 to the 100th power of 2 plus 2 to the 99th power of 2 plus 2 to the 98th power of 2

Summation formula with equal ratio sequence
=2*(1-2^100)/(1-2) -1
=2^101-3