A bag contains 3 red and 4 black balls. If two balls are drawn at random without replacement, what is the probability that both are red? MCQ with Answer and Explanation

Explanation:
Mailed questionnaires suffer from high non-response as respondents often ignore or forget to return them.

Explanation:
WPI primarily tracks prices of goods (primary articles, fuel, manufactured products) at wholesale stages, with limited service coverage, making it more responsive to commodity price fluctuations.

Explanation:
Data published by international organizations are secondary sources for researchers who use them for their own studies.