Question

(7) Which of the following will have 1 in the unit place?
(a) (20)²
(b) (34)²
(c) (18)²
(d) (19)²​

Answer 1

Answer:

(d)

Step-by-step explanation:

19*19

9*9 = 81 1 is in unit place.

Answer 2

$\boxed{(d) \:(19)² }$

Step-by-step explanation:

$(a) \: \: ({20})^{2} = (20 \times 20) = 400$

$(b) \: \: ( {34})^{2} = (34 \times 34) = 1156$

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

$(d) \: \:( {19})^{2} = (19 \times 19) = 361$

Since $(19)²$ has $1$ in its unit place, option (d) is correct.