So, as I understand
Here given, Ar are the arithmetic means between 303 and -57.
This means 303, A1, A2, A3, A4, …………………………… A29, -57 are in AP
Total 31 terms are present
Sum of these n+2 terms = 31* (303 - 57) / 2 ( i.e. n/2 * (sum of first term and last term) )
Sum of n+2 terms = 3813
So, Sum of these means = 3813 - 246 = 3567
Again, 3030 + 30d = -57
d = -12
A14 = 303-1214 = 135
Now my question is what exactly is /Ar min/ ?
is it absolute minimum of all Ar ? if so then it should be 3 and ans is not there in the options.