If AB is a double ordinate of the hyperbola x^2/a^2 - y^2/b^2 = 1 such that OAB is an equilateral triangle, O being the origin, then the eccentricity of the hyperbola satisfies :
a.e>(3)
b.1
c.e = 2/(3)
d.e>2/(3)
A new flag is to be designed with six vertical strips using some or all of the colours yellow, green, blue and red. Then, the number of ways this can be done such that no two adjacent strips have the same colour is
a.12 x 81
b.16 x 192
c.20 x 125
d.24 x 216
Unrest in Syria began on 15 March 2011 as part of the wider 2011 Arab Spring protests out of discontent with the Syrian government, eventually escalating to an armed conflict after protests calling for Assad's removal were violently suppressed.