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Units Digits in Cube Numbers

State whether...

Question

Question 71

State whether the following statement is true or false:

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

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Solution

False
$∵ (7)^{2} = 49$ ends in 9 and $(7)^{3}$ , i.e 343 does not end in 7.

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Similar questions

Question 71

State whether the following statement is true or false:

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

Question 70

State whether the following statement is true or false:

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

1

1

9

5

25

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