IF THE SUM OF FIRST m TERMS OF AN AP IS n. AND THE SUM OF FIRST n TERMS IS m, THEN SHOW THAT THE SUM OF ITS FIRST( m+n) TERMS IS -(m+n).

**Given**, sum of *m* terms = *n*

Sum of *n* terms = *m*

Subtracting equation (2) from equation (1), we get

**
**

**Given**, sum of *m* terms = *n*

Sum of *n* terms = *m*

Subtracting equation (2) from equation (1), we get

**
**

What are you looking for?