Chapter 1.2, Problem 27E

Applying What You’ve Learned.

In each of the next four exercises, we give you a series of numerical equations. Make a conjecture as to what the next two equations in the pattern are. Check your conjecture with a calculator.

a. $1+2=\frac{2\times 3}{2}$

b. $1+2+3=\frac{3\times 4}{2}$

c. $1+2+3+4=\frac{4\times 5}{2}$