Just problems abd Find a counterexample to show that each of

Just problems (a,b,d)

Find a counterexample to show that each of the statements is false. Every month of the year has 30 or 31 days. If n is an integer and n is divisible by 4, then n is divisible by 4 For every positive integer x, x^3

Solution

a) February has 28 days

b) 18 is integer N whose square is 324 which is divisible by 4 but the actual number 18 is not divisble by 4.

d) Let us say 16 which is not sum of squares of 1, 2 or 3