N is a five-digit perfect square whose unit digit is same as the tens digit. How many such N are
there? plz explain!!

1) 30
2) 31
3) 32
4) 33

• End digit 1,4,5,6,9, 0 yhi rahengi..
  Tens digit p 11 is not a perfect sqr
  44 m end wala perfect sqr hai
  Baaki sb perfect sqr nhi
  Ab no hai
  112,138, 162, 188, 212, 238, 262, 288, 312, 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310, so option is b
• 2 years agoHelpfull: Yes(0) No(1)