Question

There are 7 letters for 4 envelopes. In how many different ways can the envelopes be
filled?​

Answer 1

Answer:

you can fill 2-2 letters in 3 envelopes and then in last one you can fill 1 only

Answer 2

Given  : There are 7 letters for 4 envelopes.  

To Find :  In how many different ways can the envelopes be

filled

Solution:

Assuming one letter for one envelope

Hence  4 letters out of 7 can be selected in  

⁷C₄   ways

= 35 ways

and 4 letters in  4 envelopes can be arranged in 4!   = 24 Ways

Total Ways  = 35 * 24  = 840 ways

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