Answer:
this is called AP arithmetic progression
2, 4, 6.........
sn=n/2(2a+(n-1)d)
S27=
[tex] \frac{27}{2 } (2 \times 2 + (27 - 1)2)[/tex]
[tex] \frac{72}{2} (4 + (26 \times 2)[/tex]
[tex] \frac{27}{2} (4 + 52)[/tex]
[tex] \frac{27}{2} \times 56[/tex]
[tex]27 \times 28[/tex]
=756
