## Yahoo! Group Title 1+2+4+8+16+32.............. = ? Find the Sum one year ago one year ago

1. DhopeChickita Group Title

64, 128,256,512

2. Yahoo! Group Title

1 (1+2+4+8+16+32.............. ) (2-1)(1+2+4+8+16+32.............. ) = 2 + 4 +8+ 16 +32 ....... -1-2-4-8-16-32.......... = -1

3. DHASHNI Group Title

its infinity

4. Yahoo! Group Title

Lol...i knw....Nw tell me wats the wrong in my sloution

5. DHASHNI Group Title

huh they haven't given the last term and btw its basically a geometric progression

6. Yahoo! Group Title

Do u Find any mistake in the way i did....

7. DHASHNI Group Title

yeah !!!!! there is a mistake in ur where did that -1 come from????

8. Yahoo! Group Title

2-1 = 1...................lol

9. mayankdevnani Group Title

limit help....

10. mayankdevnani Group Title

... 4, 8, 16, 32 ... 512 or 4(1), 4(2), 4(4), 4(8), ... , 4(128) or 4(2^0), 4(2^1), 4(2^2), 4(2^3), ... , 4(2^7) S(n) = 4 ∑ 2^k [ k = 0 to n ] ....... = 4 [ 2^(n+1) - 1 ] S(7) = 4 [ 2^(7+1) - 1 ] ....... = 1020

11. Yahoo! Group Title

Lol....i dont need the answer..) i want to knw is there any mistake in my solution

12. mayankdevnani Group Title

don't angry @Yahoo! it's my limit

13. Yahoo! Group Title

lol....i am not angry ...this is a Funny....question....

14. mayankdevnani Group Title

just apply my method and get the answer

15. DHASHNI Group Title

@Yahoo! : its not that let the series be A by ur terms => (2-1)A =>2A -A =A

16. Yahoo! Group Title

oho...Again..... Tell me is there any wrong...lol

17. DHASHNI Group Title

got it!!!!

18. mayankdevnani Group Title

$\Huge{\bf{\color{blue}{i know you can }\color{red}{doit}}}$

19. furnessj Group Title

I hate these! I can't see see what is wrong but obviously there is something as it should total infinity... I would just do the 2-1 in the bracket and get the same answer... (is it not that there will always be one last term in the positive set of numbers which is much bigger than its negative counterpart in that set, and eventually that is infinity..?)

20. Yahoo! Group Title

1 (1+2+4+8+16+32.............. ) (2-1)(1+2+4+8+16+32.............. ) = 2 + 4 +8+ 16 +32 ....... -1-2-4-8-16-32.......... = -1

21. furnessj Group Title

Also... first terms, 2-1 = 1, second terms: 4-2 = 2, so you DO get the original series back, and it does NOT equal -1.

22. DHASHNI Group Title

2+4+8+16+32..................+2n 1+2+4+8+16+32............. + n {subtracting} ----------------------------- 1+2+4+8+16 +32+...........n

23. Yahoo! Group Title

take make sense @DHASHNI

24. DHASHNI Group Title

WAT!!!

25. Yahoo! Group Title

*that

26. Yahoo! Group Title

Sorry

27. furnessj Group Title

exactly @DHASHNI ! have a medal too :)

28. CliffSedge Group Title

You are subtracting sets of different cardinality. That's like adding unlike terms, you can't do it.

29. UnkleRhaukus Group Title

1 (1+2+4+8+16+32.............. ) (2-1)(1+2+4+8+16+32.............. ) = (2 + 4 +8+ 16 +32 +64+......)+( -1-2-4-8-16 -32 .........) = 63+.....