Problema Solution
2+8+14+20+...+80 what is the sum not using forumlas.
Answer provided by our tutors
2+8+14+20+26+32+38+44+50+56+62+68+74+80 =
= (2 + 80) + (8 + 74) + (14 + 68) + (20 + 62) + (26 + 56) + (32 + 50) + (38 + 44) =
= 82 + 82 + 82 + 82 + 82 + 82 + 82 = 7*82 = 574