## anonymous 5 years ago Find the sum. 1 + 4 + 16 + · · · + 16,384 can someone help ?

1. amistre64

n=[0,?]; [E]4^n ??

2. amistre64

4^0 + 4^1 + 4^2 + 4^3 + 4^4 .....etc right?

3. anonymous

right

4. amistre64

4^7 is the tops

5. amistre64

we can put it in 7 times in the googl bar to get a sum... but other than that im clueless..

6. anonymous

Ok Thanks

7. amistre64

(4^0) + (4^1) + (4^2) + (4^3) + (4^4) + (4^5) + (4^6) + (4^7) = 21 845

8. amistre64

there is prolly a fancier way to do that, but i cant recall it :)

9. anonymous

so the answer would be 21/845?

10. amistre64

21,845

11. anonymous

Oh ok thanks for your help!

12. amistre64

$\sum_{n=0}^{7}4^n$