Question: a . sum _ ( n = 2 ) ^ ( infty ) ( ( - 1 ) ^ ( n ) )

a.
\sum_(n=2)^(\infty )((-1)^(n))/(2^(2n+1))
b.
\sum_(n=0)^(\infty )3^(n-2)7^(-n+1)
C.
\sum_(n=0)^(\infty )((1)/(n+1)-(1)/(n+2))
(hint: part c is telescoping, write out the first few terms to see the pattern!)
a . \ sum _ ( n = 2 ) ^ ( \ infty ) ( ( - 1 ) ^ (

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