Question

aflati cate numere se gasesc in fiecare dintre secventele de mai jos: a) 5 , 10 , 15, . . . . . , 145 b) 3,6, 9 , . . . . . , 363 c) 1,5, 9 , 13 , . . . . . > 153 d) 7, 10, 13, 16 , . . . . , 91 e) 11 , 13 , 15,17, . . . - , 137 f) 4, 9 , 14 , 19 , . . . . , 99

Answer 1

 

$\displaystyle\bf\\a)~~~n=\frac{145-5}{5}+1=\frac{140}{5}+1=28+1=29~de~numere\\\\\\b)~~~n=\frac{363-3}{3}+1=\frac{360}{3}+1=120+1=121~de~numere\\\\\\c)~~~n=\frac{153-1}{4}+1=\frac{152}{4}+1=38+1=39~de~numere\\\\\\d)~~~n=\frac{91-7}{3}+1=\frac{84}{3}+1=28+1=29~de~numere\\\\\\e)~~~n=\frac{137-11}{2}+1=\frac{126}{2}+1=63+1=64~de~numere\\\\\\f)~~~n=\frac{99-4}{5}+1=\frac{95}{5}+1=19+1=20~de~numere$