Question

find the sum of the AP 0, -7, -14 to 45 terms​

Answer 1

Answer:

-6930

Step-by-step explanation:

given AP is 0,-7,-14....to 45 terms

let a=0 . n=45

d= -7-0 = -7

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

=45/2[2(0)+(45-1)(-7)]

=45/2[0+(44)(-7)]

=45/2[-308]

=45×(-154)

Sn=-6930