sequences & series formulae
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Last updated 4:25 PM on 9/11/24
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9 Terms
1
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overall Un equation
Un = Sn - Sn-1
2
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common difference of AP
Un - Un-1 = d
3
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Un of AP
Un = a + (n-1)d
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Sn of AP
Sn = (n/2)[2a + (n-1)d] OR Sn = (n/2)(a + l)
5
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Common ratio of GP
Un/Un-1 = r
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Un of GP
Un = ar^(n-1)
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Sn of GP
Sn = a(1-r^n)/(1-r) OR Sn = a(r^n-1)/r-1
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condition for sum to infinity for GP
|r| < 1
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Sum to infinity for GP
Sum to infinity = a/(1-r)
Note 
Flashcards (45)