Today may be a range bound expiry for bank nifty. We can try short strangle with following options
Short 29800CE and 29200PE. Bank nifty is having strong resistance around 27980 levels and good support at 29250 levels for premium of 35 and 25.
My expectation is bank nifty will close between this levels today.
Margin required for above strategy 70K and return expected is premium of around 50 i.e. 50X25=1.2K
This idea is for educational purpose only but should not be treated as a call for trade.