On review of resolved questions, I have observed many wrong answers are awarded 'BEST ANSWERS', while correct answers available for the same are ignored. For example, -
1) A question is given for finding the 'n th' term of the series; which is neither AP nor GP nor HP nor combination of any of them. However using the special method of "SUM Difference", the 'n th' term of this can be found out. A member answered in one line as "9 th term of this series is '---'." This was awarded as BEST Answer. There another perfect answer using the special method of 'SUM difference' is shown and expressed the 'n th' term in the form of "ax^2 + bx + c", after working for about 10 steps. But this has been ignored.
2) One more question: - "Find from first principles the derivative of the function (ax^2 + bx)".
A member casually answered the same in one step using the formula, which has been awarded as BEST ANSWER'. However, for the same two, three members have taken lot of patience in working elaborately using first principles method and giving the answer. But all these have been ignored.
3) Similarly I have observed many undeserved BEST Answers award. Hence, my opinion is the BEST Answer selections are biased and as such they are not reliable and may not be applied confidently by others.