Solution for the below problem is here:
since in the mentioned problem there is no condition such as every finger has to have at least 1 ring so,
every ring has 4 choices- 4 ways( it can be worn in any one of four fingers)
considering we have 5 rings so total no of ways in which 5 rings can be worn in four fingers -4x4x4x4x4 that is 4^5.
I hope it is well understood...
solution for the 7 picture problem:
Since using basic logic we can assume that on 1 nail we can hung only 1 picture. So,
1st nail has 7 picture choices- 7 ways
2nd nail has 6 choices since 1 picture is already hung on 1st nail- 6 ways
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.
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5th nail has 3 choices since 4 pictures are already hung on 4 nails-3 ways
multiplying all these possibilities- 7x6x5x4x3
we get total no of ways in which all these pictures can be hung-2520 ways.
what exactly is this slot method???
