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#21 Help

 Mar 16, 2018
 #1
avatar+96200 
+2

a)  Lower limit   = 1st term =   1     

 

Upper limit  =  18th term  =  18

 

b)  We need to find the 18th  term.....this  is  3 + 7(18 - 1)  =

 

3 + 7 * 17   = 

 

  122

 

The sum  is  given by :

 

[ 1st term + 18th term ]  *  number of terms / 2  =

 

[ 3 + 122 ]  *  18  / 2  =

 

[ 125 ]  * 9  =

 

1125  beads  !!!

 

 

cool cool cool

 Mar 16, 2018

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