Question

3. The total number of 9 digit numbers of different digits is​

Answer 1

Answer:

Explanation:

This article is about four-sided mathematical shapes. For other uses, see Quadrilateral (disambiguation). Quadrilateral Some types of quadrilaterals Edges and vertices 4 Schläfli symbol {4} (for square) Area various methods; see below Internal angle (degrees) 90° (for square and rectangle) In Euclidean plane geometry, a quadrilateral is a polygon with four edges (sides) and four vertices (corners). Other names for quadrilateral include quadrangle (in analogy to triangle), tetragon (in analogy to pentagon,

Answer 2

Explanation:

n! =n (n-1)(n-2)(n-3)........ (3)(2)(1)

no. of ways of filling first place =9

no. of ways of filling remaining 8 place

=9×8×7×6×5×4×3×29×8×7×6×5×4×3×2

=9!=>9!

total no.of numbers =9×9! 9×9!