SEQUENCE: SOLVING THE SUM OF THE FIRST TERM OF AN A.P

                                                                               
 The sum of the first nᵗʰ term of an Arithmetic Progression is giving by


sₙ ₌ n/2 [2a + (n-1) ]....(1) [ infinite A.P]

 Sₙ = n/2 = (a + L) ..... ( finite A.P)
where, sₙ = a + ( a + d) + (a + 2d) .....+ [a + (n - 1)d]
d = common difference,   
a = first term
n = number of term
l= last term

                       Worked examples

 


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