The prime triplet is .

The greatest five digit number exactly divisible by $9$ and $13$ is

From the numbers $2, 3, 4, 5, 6, 7, 8, 9$ how many pairs of co-primes can be formed?

If the number $2345a60b$ is exactly divisible by $3$ and $5$, then the maximum value of $a+b$ is

The $\mathrm{HCF}$ of $100$ and $101$ is ______.

The $\mathrm{LCM}$of $100$ and $101$ is

The greatest four digit number which when divided by $18$ and $12$ leaves a remainder of $4$ in each case is

The $\mathrm{GCD}$of two numbers is $17$ and their $\mathrm{LCM}$ is $765$. How many pairs of values can the numbers assume?

The number of factors of $1080$ is