How many arrangements are possible with the letters of the word. ENGINEERING?

How many elements are known till date?

How many tangents can a circle have?

How many chambers are present in the heart of a cockroach?

How many dynes make a newton?

How many ergs make one joule?

How many segments are found in the abdomen of a cockroach?

How many words with or without meaning can be formed using all the letters of the words EQUATION using each letter exactly once?

Find how many words can be formed of the letters of the words: DAUGHTER so that the vowels may never seperated.