Math, asked by Mrlspn5750, 5 months ago

If Sn denotes the sum of the first n terms of an A.P .,then S2-S1=----

Answers

Answered by Anonymous

2

Answer:

Step-by-step explanation:

S2=a+a+d=2a+d

S1=a

S2-S1=2a+d-a

a+d=second term of A.P series

this an important formula

Sn-Sn-1=tn=nth term of A.P series

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