Question

By adding which of the follow
wing which of the following numbers does
the product of 15 16 17 18 becomes a
perfect square :​

Answer 1

3×5×2×2×2×2×17×3×3×2

=3^2×4^2×5×2×3×17

=9×16×510

=73440

73441=(271)^2

so

1 should be added

Answer 2

18+18=36

6×6=36

36 is a perfect square

ans:18