The number of natural numbers smaller than `10^4` of which all digits are different, is

The number of natural numbers less than 7,000 which can be formed by using the digits 0, 1, 3, 7, 9 (repetition of digits allowed) is equal to

Find the number of natural numbers which are less than 2xx10^8 and which can be written by means of the digit 1 and 2.

Numbers of natural numbers smaller than ten thousand and divisible by 4 using the digits 0,1,2,3 and5 without repetition is n then

The number of 4 digit natural numbers such that the product of their digits is 12 is

Number of natural numbers lt2.10^(4) , which can be formed with the digits, 1,2,3 only is equal to

Number of natural numbers of two or more than two digits in which digits from left to right are in increasing order is (A) 502 (B) sum_(r=2)^n |__r (C) 9|__9 (D) none of these

Number of natural numbers less than 1000 and divisible by 5 can be formed with the ten digits, each digit not occuring more than once in each number is

The total number of six-digit natural numbers that can be made with the digits 1, 2, 3, 4, if all digits are to appear in the same number at least once is a. 1560 b. 840 c. 1080 d. 480

The number of distinct natural numbers up to a maximum of four digits and divisible by 5, which can be formed with the digits 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9 each digit not occurring more than once in each number, is a. 1246 b. 952 c. 1106 d. none of these

The total number of 9 digit numbers which have all different digits is