Question

if a1,a2,a3,a4.....formap,then a2 is equal to?

Answer 1

then a2=a1+(n-1)d.....where d=a2-a1=a3-a2
or we cañ say.... ....
a2=(a1+a3)/2....
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Answer 2

As a1,a2,a3,a4 form an ap
so there will be constant difference in between them I.e
a2-a1=a3-a2
2a2=a1+a3
a2=(a1+a3)/2
Or
nth term = a+(n-1)D
a2=a1+D where n=2
where D is the common difference