Elitmus Exam Numerical Ability Data Sufficiency

N^3-1 will be prime for which value of the following (example for N=2, N^3-1=7 which is a prime)
a)3

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Elitmus Other Question

A parallelogram having an acute angle of 30 degrees whose area is equal to the perimeter and the sides are whole numbers then number of such parallelograms possible are
a) 0 b) 1 c) 2 d) 3
K is a 3 digit number .K1, K2, K3 are numbers obtained when K is in base 5,7 and 9 respectively. The units place in K1, K2, K3 is 2. How many such possible K values are there
a) 0 b) 1 c) 2 d) 3