Question

find the 15th term of given A. P. 2,4,6,8,10​

Answer 1

Answer:30,240

Step-by-step explanation:

Let a be the first term and d the common difference

a=2

d=4-2=2

So, 15th term= a+(15-1)*d

=2+(14*2)

=2+28

=30

Sum of first 15 terms = n/2(a+an), where n= number of terms

=15/2(2+30)

=15/2(32)

=15*16

=240

Answer 2

Here is your Answer dear:

2,4,6,8,10..........

a=2

d=2

a15=a+14d

=2+14*2

=2+28

15th term of ap =30

Sum of n terms=n/2(2a+(n-1)d))

Sum of 15 terms=15/2(4+14*2)

=15/2(32)

=240

Regards

Sahil2dracula