CAS Exam 7 - Mack 1994 - Standard Error for total reserve

Hi,

I am having problem calculating the S.E for the total reserve, and I think I am applying the formula wrong. The formula for it should be :

So, for the following triangle:

image

Would the S.E for the reserve be:

Would it be:

1000+200*(210+220+230)(213/(180))+

2000+210*(220+230)(212/(170+180)+2*13/(180))+

3000+220*(230)(211/(160+170+180)+212/(170+180)+213/(180))+

4000+230 * 0 * (210/(150+160+170+180)+211/(160+170+180)+212/(170+180)+213/(180))

nm… I figured out. I fliped a and k in my formula. :sweat_smile: