Question

find the sum of two middle most terms of AP -4/3,-1,-2/3,...........13/3​

Answer 1

Step-by-step explanation:

an=a+(n-1)d

13/3= -4/3+(n-1) ×1/3

13/3+4/3 =(n-1)/3

17/3 =(n-1)/3

17=n-1

n=18

middle most terms are 9th and 10th terms

a9= -4/3+8×1/3

= -4/3 +8/3

= 4/3

a10= 4/3+1/3

= 5/3

a9+a10= 4/3+5/3

=9/3

=3

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Answer 2

Answer:

3

Step-by-step explanation:

an=a+(n-1)d

13/3= -4/3+(n-1) ×1/3

13/3+4/3 =(n-1)/3

17/3 =(n-1)/3

17=n-1

n=18

middle most terms are 9th and 10th terms

a9= -4/3+8×1/3

= -4/3 +8/3

= 4/3

a10= 4/3+1/3

= 5/3

a9+a10= 4/3+5/3

=9/3

=3