css3 selector, nth child incrementing by 1

Question

i am using css3 selector to select different childs . is their any alternative instead of hardcoding it

.checkout_main .check_tr th:nth-child(1){
    width:50px;padding-left:10px;
}
.check_tr th:nth-child(2){
    width:300px;padding-left:10px;
}
.check_tr th:nth-child(3){
    width:50px;padding-left:10px;
}
.check_tr th:nth-child(4){
    width:100px;padding-left:10px;
}

Answer 1

There are two alternatives

You can use odd even
:nth-child(odd)
{
  width: 100px;
}

:nth-child(even)
{
  width:200px; 
}

Another way is you have to formulate an+b . Then it works, Let me know your html. Ii ll try and tell you an+b form.