Question

If numbers are formed using digits 2,3,4,5,
6 without repetition, how many of them will
exceed 400? The numbers can be formed of 3 digits , 4 digits , 5 digits .
How many numbers will be formed ?​

Answer 1

Step-by-step explanation:

when we make 3 digit numbers,

first place can be filled in 3ways that is by 4,5or 6

2nd place can be filled in 4 ways

3rd place can be filled in 3 ways

total number of ways=3×4×3=36

when we make 4 digit numbers,

first place can be filled in 5ways

2nd place can be filled in 4 ways

3rd place can be filled in 3 ways

4th place can be filled in 2ways

total number of ways=5×4×3×2=120

when we make 5digit number,

1st place can be filled in 5 ways

2nd place can be filled in 4ways

3rd place can be filled in 3 ways

4th place can be filled in 2 ways

5th place can be filled in 1 way

total number of ways=5×4×3×2×1=120

in making all number ,total number of ways=36+120+120=276

Answer 2

here is you answer

that is 276 ways

Happy study