A fitness center calculates its monthly efficiency score using the following expression: (Trainers)2 - (Cancellations)1/2 + (Equipment)1/3. If the center has 21 trainers, 256 membership cancellations, and 729 equipment pieces, what value will come in place of question mark (?) in the following equation? (21)2 - (256)1/2 + (729)1/3 = ?

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?