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Grade:

                        

how many numbers less than 4321, can be formed from the digits 1,2,3,4,if repetition is allowed?

8 years ago

Answers : (3)

Rohit Yadav
34 Points
							

The answer is 340.

8 years ago
Kolla Raja Sekhar
51 Points
							

232

8 years ago
Md Rizwan
33 Points
							

when the thousands place is fixed as 1 ,  then the number formed is 1...       with repitition allowed, the three places can be filled in 4*4*4= 64 ways
similarly, fixing 2 at the thousands place, we have 4*4*4 =64 ways of forming a four digit - number
also fixing 3 at the thousands place we have 64 four-digit numbers
fixing 4 at the thousands place, we can have the hundreds place in 3 ways , but the tens place can be filled only in 1 way because we cannot have 2 or 3 or 4 at the tens position as per the condition given .   and the units place can be filled in 4 ways 
so, total number of ways of forming  a four digit number under the condition given to us =64 +64+64+ 3*4 = 204 ways
but we can form 1 digit number in 4 ways, two digit numbers in 4*4=16 ways, three digit numbers in 4*4*4 = 64 ways, so total numbers we can form = 204+4+16+64

8 years ago
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