Please helpe out

a) 8
b)12

a)1
b)2
c)2
d)3
e)3

5)Number of digits in square root of 390625 .?

39??06??25??(taking 2 term together and starting from right .)

Number of digits in square root? will be 3 as the number is divided into three group.

Hope this would have cleared your doubt . ?
Regards Soham..