A level History exam revision resources written by A level Examiners




 

 
 
 
 

This lesson looks at...


  • Revise Sigma notation
  • nth term of an Arithmetic Progression (AP): Un = a + (n 1)d
  • The sum of the first n terms of an AP:-
  • Sn = n/2 [2a + (n 1)d]
  • Sn = n/2 [first term + last term]
  • Solving questions with "the three formulae"


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