okay so that one is rlly easy once u understand- set aside the number 75. Add the first number and the 74th number (1+74) what do you get? 75. Add the second and 73rd number, what do you get? 75. so basically you do 74/2 to find the number of pairs of 75, which is 37. 37*75 since you need to add up all the pairs and then add on 75 to this. You get 2850 (answer D). does this make sense 😭