John wants to go abroad by ship and return by air he has a choice of 6 different shapes to go and 4 Airlines to return in how many ways can he perform his journey

Dear Student 
This is the very first conceptual question of combination.
There are 6 different choices of ship for going & 4 choices of airline for returning
He can choose any one choice for going & any one choice for returning
So,
Number of way of going abroad is 6
(​​6C1=6)  
now number of way of returning is as 4C1=4
So total no. of way of completing journey is 6×4=24
Regard
 

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