numbers2

The number of numbers that can be formed by using the digits 1,2,3,3,3,2,1 so that odd digits always occupy odd palces is

3 Answers

62
Lokesh Verma ·

1 digit: 2 ways

2 digit: 2.1 way (even digit can only be filled by 2!)

3 digit: 2.1.2 ways

4 digit: 2.1.2.1 ways

5 digit: 3 odd spaces..
case (all 3's): 1 way
case (2 3's): 3 ways
case (1 3's): 3 ways
Total = 7

Take sum...

24
eureka123 ·

sir answer=18..............

62
Lokesh Verma ·

1
3
12
32
121
123
321
323
1212
1232
3212
3232
12123
12321
12323
32121
32123
32321
32323

These are 19!

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