answer the questions on the basis of the info given below..
A set c is defined such that c=(z-2,z-1,z,z+1,z+2) and z is an integer.
for z=72 to 136,how many of the sets will always contain a multiple of 9?
a.24 b.23 c.32 d.8 e.7
for z=11 to 99,how many sets will contain atleast one perfect square?
a.19 b.21 c.18 d.6 e.none of these
plz give a detail solution..