Answer
Conjecture is correct.
Work Step by Step
1+2+3+4+5+6 = $\frac{6 *7}{2}$
L.H.S = 1+2+3+4+5+6
= 21
R.H.S= $\frac{6 *7}{2}$ = $\frac{42}{2}$ = 21
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 1 - Problem Solving and Critical Thinking - 1.1 Inductive and Deductive Reasoning - Exercise Set 1.1 - Page 11: 47
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