Which is not a sample of classification problem? 1. To predict whether a customer switches to another provider or brand
2. To predict the category to which a customer belongs to​

You forgot to add the possibilities. we don't know the options from which to choose.

Cprogram to find //perimeter of rectangle printf(" \n perimeter of rectangle \n"); printf(""); printf("\n enter width and length of the rectangle : "); scanf("%f%f", & width,& length); perimeter = 2 * (width + length); printf("perimeter of rectangle is: %.3f", perimeter);  

Answer/// it lowers your credit score.

The answer is: a join on clause.