Help in Set Expression

[vpanchuda]

Hi Can any experts help me with below data.

I need the set expression to count the number of  A1,A2, and A3 and group it.

Condition

if Attendance is 'NO, and Grade is 'A1' and if date id blank count 1 

if Attendance is 'NO, and Grade is 'A2' and if date id blank count 1 

if Attendance is 'NO, and Grade is 'A3' and if date id blank count 1 

Grade	Attendance	Date
A1	NO	01-02-2019
A2	NO	___
A3	NO	02-02-2019
A1	NO	___
A2	NO	04-02-2019
A3	NO	05-02-2019

[sunny_talwar]

Look here Qlik Sense Set expression