Question

The sum of first 12 terms of the AP -37. - 33, - 29... is

Answer 1

Step-by-step explanation:

a= -37

d= -33-(-37)

d= -33+37

d= 4

n=12

Sn=n/2 [2a+(n-1)d]

S12=12/2 [2 (-37)+11 (4)]

=6×[-74+44]

=6×[-30]

= -180