Let this letter be read .

Assuming that a person of normal sight can read print at such a distance that the letters subtend an angle of 5' at his eye. Find what is the height of the letters that he can read at a distance of 756 meteres ?

Assuming that a person of normal sight can red print to such distance that the letters subtend and angle of 5 at his eye,find is the height of the letters that he can read at a distance of 12 metres.

Word of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J. Let x be the number of such words where no letter is repeated; and let y be the number of such words where exactly one letter is repeated twice and no other letter is repeated.The,(y)/(9x)=

A letter is known to have come from either MAHARASTRA or MADRAS. On the postmark only consecutive letters RA can be read clearly. What is the chance that the letter came from MAHARASTRA?

6 letters are to be posted in three letter boxes. The number of ways of posting the letter when no letter box remains empty is

Let A be the sets of the letters in the world "RAIGARH" and B be the sets of the letters in the word "PRATAPGARH" then n(A subset B) represents.