s number puzzle. There must be at least five orizontal and vertical arrangements of ons should involve arithmetic sequence Horizontal 1) Insert an arithmetic mean between 15 and 35. 3.) Find the sum of the first 8 tarms in the arithmetic sequence 2,4,6,8. 5.) Insert an arithmetic mean between 6 and 12. 7.) Insert an arithmetic mean between 9 and 27. 9.) Find the sum of the arithmetic sequence-2-1 0,1,2 Vertical 2) Insert an arithmetic mean between 25 and 65. 4.) Insert an arithmetic mean between 13 and 25. 6.) Find the sum of the arithmetic sequence-2-1, 0,1.2.3. 8.) Insert an arithmetic mean between 3 and 9. 10.) Insert an arithmetic mean between 6 and 18.