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1)

Starting with the number 100, Shaffiq repeatedly divides his number by two and then takes the greatest integer less than or equal to that number. How many times must he do this before he reaches the number 1?

2)

What is the following value when expressed as a common fraction: \(\frac{1}{2^{1}}+\frac{1}{2^{2}}+\frac{1}{2^{3}}+\cdots + \frac{1}{2^{8}}+\frac{1}{2^{9}}+\frac{1}{2^{10}}?\)

 May 5, 2020
 #1
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+1

(1)

100/ 2  = 50

50/2  = 25

25/ 2  =  12.5  = 12

12/ 2  = 6

6/2  = 3

3/2  = 1.5   =  1

 

(2)

1/2  + 1/4  + 1/8  +.......+1/256  + 1/512 + 1/1024

 

Note  that   1/2 + 1/4 =  6/8  = 3/4

And 3/4 + 1/8  =  6/8 + 1/8  = 7/8

And 7/8 + 1/16  =  14/16 + 1/16  = 15/16

 

So....the sum is   [ 2^n - 1 ] / 2^n  = [ 2^10 - 1 ] / 2^10  =   1023/ 1024

 

 

 

cool cool cool

 May 5, 2020

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