Use Euclid's division algorithm to find the $\mathrm{HCF}$ of $1651$ and $2032$.

A natural number when divided by $5,6,7$, and $8$ leaves the remainder $4$ in each case. What will be the second number when these numbers are presented in ascending order?

Find the HCF of 3, 7 and 15. 

(A) 7 

(B) 15 

(C) 3 

(D) 1 

When $2238, 4309$ and $8151$ are divided by a certain $3$-digit number, the remainder in each case is same. The remainder is _______.