abc is a 3 digited number then abc + bca + cab is not divisible by …

Which of the following is divisible by 9?

One of the multiples of 9 is …

$\sum n\backslash sum\; n$ = ……

1 + 1 + … + 10 times = …

1 – 1 + 1 – 1 + … 9 times = …

$1^2+2^2+3^{2}1^2+2^2+3^2$ + …… $n^{2}n^2$ = ……

Which of the following is divisible by 11?

General form of an even number …

$\sum n^3\backslash sum\; n^3$ = ……