Question

IQ- Which of the following will have 1 at its unit place? (a) 19² (b)17² (c)18² (d)16²​

Answer 1

Answer:

$a) \: {19}^{2} = 361$

$b) \: {17}^{2} = 289$

$c) \: {18}^{2} = 324$

$d) \: {16}^{2} = 256$

So 19^2 will have 1 in unit place.

Ans. a) 19^2

Hope it helps.

Answer 2

Answer:

a

Step-by-step explanation:

19×19

361

or

you can just multiply unit digit of given number

9×9=81 (✓)

7×7=49(×)

8×8=64(×)

6×6=36(×)

from this you just identify which number has 1 at its unit place

finally answer is (a)