Number of five digit numbers of the form `d_1 d_2 d_3 d_4 d_5` where `d_(i's) i=1,2,3,4,5` are digits and satisfying `d_1 < d_2 <= d_3 < d_4 <= d_5.` is

The sum of all five digit numbers formed with the digits 1,2,3,4,5 without repetition of digits are

Number of all four digit numbers having different digits formed of the digits, 1,2,3,4 and 5 and divisible by 4 is 24 b. 30 c. 125 d. 100

The number of four-digit numbers that can be made with the digits 1, 2, 3, 4, and 5 in which at least two digits are identical is a. 4^5-5! b. 505 c. 600 d. none of these

The number of four-digit numbers that can be made with the digits 1,2,3,4, and 5 in which at least two digits are identical is a.4^(5)-5!b .505 c.600 d.none of these

The number of four-digit numbers that can be made with the digits 1, 2, 3, 4, and 5 in which at least two digits are identical is a. 4^5-5! b. 505 c. 600 d. none of these

The number of four-digit numbers that can be made with the digits 1, 2, 3, 4, and 5 in which at least two digits are identical is a. 4^5-5! b. 505 c. 600 d. none of these

The number of four-digit numbers that can be made with the digits 1, 2, 3, 4, and 5 in which at least two digits are identical is a. 4^5-5! b. 505 c. 600 d. none of these

Number of all four digit numbers having different digits formed of the digits,1,2,3,4 and 5 and divisible by 4 is 24 b.30 c.125 d.100

The number of five-digit numbers which are divisible by 3 that can be formed by using the digits 1,2,3,4,5,6,7,8 and 9 , when repetition of digits is allowed, is (a) 3^(10) (b) 4.3^(8) (c) 5.3^(8) (d) 7.3^(8)