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   Arithmetic Progressions - Class X
Formulae, Relations, Identities etc.
Arithmetic Progressions (AP)
General term or nth term 
Tn = a + (n - 1) d where a is the first term and d is the common difference. 
                                          Arithmetic Progressions (AP)
Sum of n terms 

Sn = n/2 [2a + (n - 1) d]          where a is the first term and d is the common difference.

Or 

Sn = n/2 (a + l)                           where l is the last term.
Demo: Explicit load of a +1 button