By using the fact $g.c.d. (a, b) \times l.c.m. (a, b) = a \times b$,find $l.c.m. (26, 91)$.

Show that the square of any odd integer is of the form $4q + 1$ for some integer $q$.

Find the $\text{LCM}$ and $\text{GCD}$ of the following numbers using the fundamental theorem of arithmetic: $17$,$23$,and $29$.

State whether the following rational number has a terminating decimal expansion or not. If it has,then find it: $\frac{55}{150}$

According to Euclid's division lemma,for given positive integers $a$ and $b,$ there exist unique non-negative integers $q$ and $r$ such that $a = bq + r,$ where ...........

Find the $\text{g.c.d.}$ (Greatest Common Divisor) of $196$ and $38220$ using Euclid's division algorithm.