Which two signs should be interchanged to make the given equation correct?
$$15 - 18 + 14 \times 3 \div 3 = 19$$

Option (a) $$'\times'\ and\ '-'$$

$$15 \times 18 + 14 - 3 \div 3 = 19$$

$$270 + 14 - 1 = 19$$

$$283\ne19$$

The given equation is not satisfied. So this is not the correct answer.

Option (b) $$'+'\ and\ '-'$$

$$15 + 18 - 14 \times 3 \div 3 = 19$$

$$15 + 18 - 14 \times 1 = 19$$

$$33 - 14 = 19$$

19 = 19

The given equation is satisfied. So this is the correct answer.

Option (c) $$'\times'\ and\ '+'$$

$$15 - 18 \times 14 + 3 \div 3 = 19$$

$$15 - 18 \times 14 + 1 = 19$$

The given equation is not satisfied. Because it will give the negative values. So this is not the correct answer.

Option (d) $$'+'\ and\ '\div'$$

$$15 - 18 \div 14 \times 3 + 3 = 19$$

The given equation is not satisfied. Because it will give the fractional values. So this is not the correct answer.