Question

Find the sum: (a) 2 11 + ( −5 11 ) (b) 5 12 + 2 3​

Answer 1

Answer:

It is an A.P.,

in which, a= -5, d= -8-(-5)=-3, l=-230

First calculate the number in series..

l=a+(n-1)d

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

-225=-3n + 3

3n=228

n=76.

Now,

Sum of the series  = n/2 (a+l)

 76/2 (-5-230)

38 * -235  = -8930.

So, the sum of your series would be -8930.

Answer 2

Answer:

Your answer is -3/11 -or- (-0.2727272727272727).

Hope this helps you out!

Step-by-step explanation:

Finding the sum:

(a) 2/11 + ( −5/11 )

=2/11+ (-5/11)

=2+(-5) /11

= (-3/11)

-OR-

= -0.2727272727272727