If ‘n’ is a natural number then the greatest integer less than or equal to (5 + √19)n is


:a-even. b-odd. c-even when ‘n’ is even and odd when ‘n’ is odd.
For n = 2, the value of the expression comes out to be 87.59 and 87 is not an even number.
d-even when ‘n’ is odd and odd when ‘n’ is even.[try to solve it in less than 1 minute]​​​​

1) a
2) b
3) c
4) d