There are p letters a, q letters b, r letters C.The number of ways of selecting k letters out of these if `p lt k lt q lt r` is

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

Find the number of selections of six letters from the letters of the word 'K A R N A T A K A'

Each question is based on the following alphabet-series : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Which letter will be sixth to the right of the third letter from the left of the letter which is exactly in the middle of the letters in the series given below ? A B C D E Z Y X W V Q R S T U F G H I J K L M N O P A

What should come next in the following letter series ? P Q P Q R P Q R S P Q R S T P Q R S T L P Q R S T U V P Q R S T

What should come next in the following letter series A B C D P Q R S A B C D E P Q R S T A B C D E F P Q R S T