Find the number of digits `6^(50).`

Find the number of 6-digit numbers that can be found using the digits 1, 2, 3, 4, 5, 6 once such that the 6-digit number is divisible by its unit digit. (The unit digit is not 1).

Find the number of 6digit numbers that ends with 21( eg.537621), without repetition of digits

Find the number of 4-digit numbers that can be formed using the digits 1, 2, 4, 5, 6, 8 if (a) digits can be repeated (b) digits cannot be repeated

Find the number of 3-digit numbers, formed with the digit (2,5,4,6) when repetition of the digits is allowed.

Find the number of all 6-digit natural numbers having exactly three odd digits and three even digits.

Find the number of 4 - digit telephone numbers that can be formed using the digits 1,2,3,4,5,6 with atleast one digit repeated.

Find the number of all 6-digit natural numbers such that the sum of their digits is 10 and each of the digits 0,1,2,3 occurs at least once in them.