$Compute: (50 + 0.5\times20)\div0.7$

${101}\times{102}\times{103}\times{104}$ $$is a number which is always divisible by the greatest number in the given option.

$$HCF OF $\frac23,\frac45,\frac67$

$4^{61} +4^{62}+4^{63}$ is divisible by :

$\sqrt {{30 }+ \sqrt {31}+ \sqrt{25}}$

$\sqrt {{30 }+ \sqrt {31}+ \sqrt{22+x}}$

$$find x

$\sqrt{7\sqrt{7\sqrt{7.........}}}=?$

$\sqrt{27+\sqrt{27+\sqrt{27+..........}}}=?$

$(3+\sqrt3)(3-\sqrt3)=$