Question

Find the sum of 30 term of given A.P .12,20,28,36..

Answer 1

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Answer 2

Answer:

Sum of 30 terms of given A.P is 3640

Step-by-step explanation:

Here, a=12 d=8

 So, 30th term = a+(n-1) ×d

=12+(30-1)×8

=12+29×8

=12+232

=244

Now, sum of 30 terms of the given AP is :

by using formula  :   Sn = N/2 ( A+L)

S30 = 30/2 ( 12 + 244 )

       = 15  ( 256)

      =   3640

   

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