Question

The number of 4 digit numbers greater than 3,000 can be formed out of the digits 3,4,5,6
and 7(No. digit is repeated). The number of such is
​

Answer 1

Answer:

using greatest number than others like 7,6,5,4,3.

And the answer is 76543.

Answer 2

Step-by-step explanation:

the number thus obtained must be greater than 3000.

because digits can not be repeated.

than the number of digits for 1st place= 5

the number of digits for 2nd place= 4

the number of digits for 3rd place= 3

the number of digits for 4th place= 2

By multiplicative principal,

the total number of 4 digits number= 5×4×3×2=120

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