Four dice are thrown simultaneously and the numbers shown on these dice are recorded in a 2 × 2 matrix. The probability that the matrix so formed has all different entries and is non-singular, is:

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?