Question

4+8+12+...+52-2-6-10-...-50 =?
repede

Answer 1

(1x4+2x4+...+13×4) 4x(1+2+3...+13) 4x(13×14:2) 4x13x7 364 (2-6...-50) 52-(2×1+2×3+...2×25) 52-2×{(26×27:2)}:2 13×27 351 364-351=13 Rasp final 13

Answer 2

4+8+12+16+20+24+28+32+36+40+44+48+52-2-6-10-14-18-22-26-30-34-38-42-46-50=26