Mathematics - Permutation & Combination Question with Solution | TestHub

$770=2\times 5\times 7\times 11$

We can assign 2 to x, or ${\mathrm{x}}_2$ or ${\mathrm{x}}_3$ or ${\mathrm{x}}_4$. Thus 2 can be assigned in 4 ways similarly each of 5,7,11 can be assigned in 4 ways

$\text{ ∴ }\text{ No. of solutions }=4\times 4\times 4\times 4=256$