Question

Which of 172,344,252,569 would have 6 at unit place on squaring?
(a) 172
(b) 344
(c) 252
(d) 569​

Answer 1

Solution:

$172^{2} = 29,584\\344^2= 1,18,336\\252^2=63,504\\569^2=3,23,761$

∵ the square of 344 has 6 at unit place.

∴ (b) 344 is the correct answer