Correct Answer - Option 3 : 1845
Given
The average of four consecutive number = 42
Formula used
Average = Sum of observation/No. of observation
Calculation
Let the four consecutive odd number be x, x + 2, x + 4, x + 6
Sum of four consecutive number = 42 × 4 = 168
⇒ 4x + 12 = 168
⇒ x = 39
So, B = x + 2 = 41
and D = x + 6 = 45
Product of B and D = 41 × 45 = 1845
∴ The required answer is 1845