Sequences & series Flashcards by Hector .

Q

Sn =

A

=n/2(2a +(n-1)d)
= n/2(a+l)

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Q

arithmetic mean of a and b

A

(a+b)/2

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Q

nth term of a GP=

A

a(n) = ar^(n-1)

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Q

Sum of first n terms =

A

S(n)= a(r^(n)-1)/(r-1)

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Q

geometric mean of a and b

A

(ab)^1/2

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