The number of different messages produced by using five signals with three dots and two dashes is

The number of different ways in which five "alike dashes" and "eight alike" dots can be arranged using only seven of these "dashes" and "dots" is a. 350 b. 120 c. 1287 d. none of these

How many different words casn be formed with five given letters of which three are vowels and two are consonants, no tow vowels being together in any word?

Using 6 different flags, how many different signals can be made by using atleast three flags, arranging on above the other ?

Find the number of different signals that can be generated by arranging at least 2 flags in order (one below the other) on a vertical staff, if five different flags are available.

Find the number of different signals that can be generated by arranging at least 2 flags in order (one below the other) on a vertical staff, if five different flags are available.

Find the number of different signals that can be generated by arranging at least 2 flags in order (one below that other) on a vertical staff, if five different flags are available.

Find the number of different signals that can be generated by arranging at least 2 flags in order (one below the other) on a vertical staff, if five different flags are available.

The number of tripeptides formed by three different amino acids is:

Find the number of different signals that can be made by arranging at least 3 flags in order on a vertical pole, if 6 different flags are available.

Given 7 flags of different colours, how many different signals can be generated if a signal requires the use of two flags, one below the other?