Lumen OHM

Find the value of the summation.

$\displaystyle {\sum_{{{i}={1}}}^{{4}}}{2}^{{i}}$

Write out the summation:

Give the total sum:

[more..]

\displaystyle

Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity

Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity