Question

L. Find the sum of the following A.Ps :-

-5+(-8) + (-11) + ......... + (-230 ).​

Answer 1

Answer:

a1= (-5)

a2=(-8)

an=(-230)

d=a2-a1=(-8)-(-5)=(-8+5)

d=(-3)

an=a+(n-1)d

-230=(-5)+(n-1)(-3)

-230=-5+(-3n+3)

-230=-5-3n+3

-230=-2-3n

-230+2=-3n

-228/-3=n

n=76

Sn=n/2(a1+an)

=76/2(-5+(-230))

=38(-5-230)

=38(-235)

Sn=-8930

Answer 2

Step-by-step explanation:

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