maths formular

Terms

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a = ? d = ? n = ? r = ?: a = the first term
d = the difference (in an AS)
r = the rate (in a GS)
n = the number in the sequence / the term
E (sigma) notation: n = (no. above E)-n+1
a = n
l = no. above E
a and l are substituted into the brakets after E
Sn = n/2(a + l)
nth term in a GS: Tn = ar^(n-1)
The nth term in an arithmetic sequence.: Tn=a+(n-1)d
the sum of n terms in a GS: Sn = (a(1-r^n)/(1-r)
r<1

Sn = (a(r^n-1)/(r-1)
r>1
The sum of n terms in an AS given the first and common difference.: Sn = n/2(2a+(n-1)d)
The sum of n terms in an AS given the first and last term.: Sn = n/2(a+l)

Number of cards 7

Created By sandle