Question

5) How many whole numbers are there between 321 and 543 which do not change, when the order of the digits is
reversed?​

Answer 1

Answer:

From 321 to 543 the numbers which cannot be changed when the order of digits reversed are 323, 333, 343, 353, 363, 373, 383, 393, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494, 505, 515, 525, 535. ∴ The total combination is 22.