If A person puts one penny in a piggy bank on the first day, two pennies in on the second day, Four pennies in on the third day, eight pennies in on the fourth day,and so forth, how much money will be in the bank after 60 Days?

Question

ikram002p · Answer

u can form a series such that 
S=1+2+3+8+.... 
now u need to find a formula of (a_n) so it could help u to expect the next 60 turm of the series.

anonymous · Answer

Would this be correct? a sub n = n *2^n?

ikram002p · Answer

mmm no it cant be , its true for the first turm but it dosnt goes well wid the second and th third

anonymous · Answer

I'm at a loss for words. My brain is exploding.

rsadhvika · Answer

$a_n =  n!!$

ikram002p · Answer

will lets try this formula assuming (a_0=0)
a_n= (a_n-1 * a_n-2) + a_2

ikram002p · Answer

now try it for the first 3 turm & forth turm u can see that 
3= 2*1 +1
8= 3*2 +2

anonymous · Answer

is this progression correct 1, 2, 3???, 8 and not 1, 2, 4, 8

anonymous · Answer

I'm sorry. You are correct.

anonymous · Answer

It would be 1,2,4,8

anonymous · Answer

LOL, OK will have to rework then  ... back in a few

rsadhvika · Answer

then its simple sequence of squares

rsadhvika · Answer

$a_n = 2^{n-1}$

ikram002p · Answer

@zJicez  which formla is incorect !

rsadhvika · Answer

n = 1, 2, 3, ....

anonymous · Answer

Ikram I wrote out the problem wrong.  I'm sorry, I edited the question.

ikram002p · Answer

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