Question

23. The cube of a natural number of the form 3n+2 is a
same form,
a) natural
b) prime
c) whole
d) even

Answer 1

The cube of a natural number of the form 3n+1 is a natural number of form 3n+1. Hint: We can find the five natural numbers of form 3n+1 by substituting 1,2,3,4,5 respectively in n and in this question 3n+1 implies that when we divide a number with 3 the remainder would be 1.