Answer:
1) True, because MR = P[1-1/e] demand is elastic if e> 1. Thus for e>1 MR is positive.
2) False, because for elastic demand increase in price will lead to fall in revenue.
3) False, because MR will be zero.( MR = P[1-1/e], put e = 1)
4) True, because MR will be positive
5) FaIse