Quant Question Of The Day: 37
[latexpage]
Counting
How many 5 digit numbers start with a prime number and end with a prime number? Further no other digit in the number is a prime number. Also, no two digits of the 5 digit number are same .
A. 1440
B. 720
C. 360
D. 120
option C.
Option A
1440
First digit options: 4 (2/3/5/7)
Last digit options: 3 since no repetition.
Middle 3 digits can’t be prime so, options 6 (0/1/4/6/8/9)
So 4*6*5*4*3=1440
4
Option A. 1440
A
A