In how many ways can 7 persons be selected from a gang of 16 persons so that (i.) no fixed 4 persons would be there (ii. ) fixed 4 persons would be there? (ans is this 792 and 220)
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A reflex action often involves a very simple nervous pathway called a reflex arc. When the body senses danger, the input-output of messages between the nerves and the corresponding action must be completed very quickly. The spinal cord sends the required signals to the muscles and the reflex action is completed.
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