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Question 70St...

Question

Question 70

State whether the following statement is true or false:

If $a^{2}$ ends in 5, then $a^{3}$ ends in 25.

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Solution

False
$∵ (35)^{2} = 1225$ ends in 5 and $(35)^{3}$ , i.e. 42875 does not end in 25.

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Question 70

State whether the following statement is true or false:

If $a^{2}$ ends in 5, then $a^{3}$ ends in 25.

Question 71

State whether the following statement is true or false:

If $a^{2}$ ends in 9, then $a^{3}$ ends in 7.

a^{2}

a^{3}

5

25

a_{1}, a_{2}, a_{3} \in + R

\frac{a_{1}}{a_{2}} + \frac{a_{2}}{a_{3}} + \frac{a_{3}}{a_{1}} \geq 3

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