Question

patru nr naturale au media aritmetica 17,5.aflati nr stiind ca primele trei sunt consecitive si au media aritmetica 13

Answer 1

a+b+c+d=4×17,5=70///a+b+c=3×13=39///d=70-39=31///a=b+1=c+2///3c+3=39/-3///3c=36///c=12!b=13!a=14!