65 is wrong coz...32 * 0 +32/2 =16....16*1+16/2=24....24*2+24/2= 60.........60*3+60/2=210.........210*4+210/2=945.........945*5+945/2=5197.5...hence 65 is wrong...................................................the one who said all wrong s a real c,,,,,k s...r