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How do our bone joints function without grinding noise and pain?

How many words (with or without dictionary meaning) can be made from the letters of the word MONDAY, assuming that no letter is repeated, if

A motorcycle licence plate has two letters and then four numbers in it.How many plates can be made without duplicating,there are no plates with number zero?

How many words (with or without dictionary meaning) can be made from the letters in the word MONDAY,assuming that no letter is repeated,if 4 letters are used at a time? All letters are used at a time? All letters are used but first is vowel?

How do organisms manage with stressful conditions existing in their habitat for short duration? Explain with the help of one example each.

Define total internal reflection. State its conditions. How do optical fibres transmit light without absorption.