Marshall Vaughn

05/09/2024 · Escuela secundaria superior

(2023) How many four-digit perfect square numbers have 4,5 or 6 in their units place \( \begin{array}{llll}\text { (1) } 42 & \text { (2) } 14 & \text { (3) } 21 & \text { (4) } 35 \text {. } \\ \text { (Hint }:(32)^{2}=1024 \text { and }(99)^{2}=9801 \ldots \text { the perfect square numbers are from } \\ 32 \text { to } 99 \text {. Units place digit should be } 4,5 \text { or } 6 . \therefore \text { the units place diglts of the } \\ \text { two-digit numbers should be } 2,4,5,6 \text { or } 8 \text {. So. numbers are } 32,34,35,36 \\ 38, \ldots, 96,98 \text {. i.e. } 5 \times 7=35 .]\end{array} \)