Explain when to use each formula:
 
 
, r 1 (Honors Only)
1
1
1
2 ( 1)
2
2
( 1)
1
1
1 1
1
1
1
1
1










  
 
  

when
r
a
S
r
a a r
S
r
a a r
S
a a r
a n d
n
S
a a
n
S
a a n d
n
n
n
n
n
n
n
n n
n
5. Honors only: Explain the parts of summation notation. Also explain how to expand, and to
how to simplify an expression in summation notation.

Question

Explain when to use each formula:
 
 
, r 1   (Honors Only)
1
1
1
2 ( 1)
2
2
( 1)
1
1
1 1
1
1
1
1
1










  
 
  

when
r
a
S
r
a a r
S
r
a a r
S
a a r
a n d
n
S
a a
n
S
a a n d
n
n
n
n
n
n
n
n n
n
5. Honors only:   Explain the parts of summation notation.  Also explain how to expand, and to 
how to simplify an expression in summation notation.