How many 7 digit numbers are present such that sum of digits is 10 and are made by 1,2 and 3 only

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Q. The number of

7

-digit numbers formed by the digits

1,

2

and

3

only whose sum of the digits equals

10,

Three digit numbers are formed using only 7 and 5. Only one of the digits can be used twice. How many 3 digit numbers can be formed and which is the greatest?

Q. The number of seven digits integers,with sum of the digits equal to 10 and formed by using the digits 1,2 and 3 only ,is

The number of seven digit integers with sum of the digits equal to $10$ and formed by using the digits $1, 2$ and $3$ only is :

Q. Number of ten-digit numbers be formed by using the digits 3 and 7 only are

2^{10}

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