Getting Ready for the Next Section

123. $P_{3} : 3 (3 + 1)$ $P_{3} : 3 (3 + 1)$ is even; true $P_{4} : 4 (4 + 1)$ $P_{4} : 4 (4 + 1)$ is even; true
125. $P_{3} : 1 + 2 + 3 = \frac{3 (3 + 1)}{2};$ $P_{3} : 1 + 2 + 3 = \frac{3 (3 + 1)}{2};$ true $P_{4} : 1 + 2 + 3 + 4 = \frac{4 (4 + 1)}{2};$ $P_{4} : 1 + 2 + 3 + 4 = \frac{4 (4 + 1)}{2};$ true
127. $P_{n + 1} : {(n + 1)}^{2} + (n + 1)$ $P_{n + 1} : {(n + 1)}^{2} + (n + 1)$ is divisible by 2.
129. $P_{n + 1} : 3^{n + 1} > 5 (n + 1)$ $P_{n + 1} : 3^{n + 1} > 5 (n + 1)$

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Table of Contents for Getting Ready for the Next Section