At what time do the two hands appear in the straight line, and at what time do they come together?

When do buds appear in a mango tree?

Light appears to propagate in straight lines because

What do you mean by tetrad?

How many arragements can be made out of the letters of the word FAILURE at a time, such that the two vowels do not come together?

How many arrangements can be made out of the letters of the word COMMITTEE at a time , such that the four vowels do not come together?

How many diffirent arrangements of the letter of the word BENGAL can be made so that the two vowels do not come together ?

In how many different ways can the letters of the word FOOTBALL be arranged so that two O s do not come together?

Find the number of ways in which the letters of the word ORION can be arranged so that two consonants do not come together.

Find the number of ways in which the letters of the word 'STATISTICS' can be arranged so that I do not not come together?