Calculate the following sums look at picture. show how i am confused.

The 'crab'  means the 'sum of'
so the first one means   the value of sum of  3 added together  20 - 3 = 17 times.

That is 3*17 = 51

The second one is the sum of the values of n^2 -2  when n = 1,2,3,4 and 5 

= 1^2 - 2 + 2^2 - 2 + + 5^2- 2
 =  1 + 4 + 9 + 16 + 25 - 10
=  45

Where's the rest of the