Grade 11Algebra
If (a+1),3a,(4a+2) are in ap. Then 7th term of the series is.....?
If (a+1),3a,(4a+2) are in ap. Then 7th term of the series is.....?
1 Answer
Parnav Bansal
First term = a+1
Common difference =3a-a-1 = 2a-1
Seventh term =first term +(7-1) common difference
=a+1+6(2a-1)
= a+1+12a-6
=13a-5
7th term = 13a-5
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