1) A 4-digit number is formed by repeating a 2-digit number such as 2525, 3232 etc. Any number of this form is exactly divisible by : A) 7 B) 11 C) 13 D) smallest 3-digit prime number Answer: Option DExplanation:Let the units digit be x and ten's digit be y Number = 1000y + 100x + 10y + x = 1010y + 101x = 101(10y+x) So this number is divisible by 101. Which is the smallest three-digit prime number.
