Let n be a 5 digit number such that `n=304a2` and `3|n` then `a=`

n-digit number

Let N be the number of 6-digit numbers such that the digits of each number are all form the set {1, 2, 3, 4, 5} and any digit that appears in the number appears atleast twice. Then the last digit of N is:

Let p be a prime number such that p>=3. Let n=p!+1. The number of primes in the list n+1,n+2,n+3,......n+p-1 is

Let n be a natural number such that the division n-:5 leaves a remainder of 4, and the division n-:2 leaves a remainder of 1. What must be the units digit of n?

Let sigma(n) denotes the sum of digits of a natural number n .If N is the smallest natural number such that sigma(N)=2020 , then find the value of sigma(5N+2021)

The total number of two digit numbers ' n ,such that 3^(n)+7^(n) is a multiple of 10 ,is