arithmetic summation

what keys do you press on the calculator to get the summation symbol

• math num

• 2nd math

• math 1

• math 0

• 36

• 450

• 250

• 3080

• 15

• 8

• 6

• -1

• 5431

• 1543

• 1435

• 1345

evaluate the related series of the sequence

13, 15, 17, 19, 21, 23

• 81

• 801

• 18

• 108

evaluate the related series of the sequence

6, 11, 16, 21, 26, 31, 36

• 147

• 471

• 741

• 47

• 365

• 563

• 356

• 653

evaluate the related series of the sequence

39, 49, 59, 69

• 261

• 126

• 621

• 216

• 7200

• 2007

• 2700

• 2070

• 54

• 45

• 36

• 63