Question

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Answer 1

Answer:

13 is answer

Step-by-step explanation:

So basically we know that

a+(a+d)+(a+2d)= 6

3a+3d=6

and also we know that there are 13 term so the last 3 term must be

a+10d+(a+11d) +(a+12d) = 16

i.e 3a+33d=16

From both equation we get

d=1/3

If d is 1/3 then a must be 2,

so sum of middle 3 terms is

a+6d+(a+7d+(a+8d)=?

3a+21d=?

3.2+21/1/3

6+7= 13

The answer is 13.

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