Answer:
Option D
Explanation:
We have
$25^{k}+12k-1$ , for all positive integer k
when k=1, $25^{1}+12(1)-1=36$
when k=2 , $25^{2}+12(2)-1$
=625+24-1=648
HCF of 36 and 648 is 36
So, greatest divisor is 36
$\therefore$ d=36
Now. 44 $\sqrt{d}=4\sqrt{36}=4 \times 6=24$