# Complete the following Number series:

1, 3, 11, 47, ……………., 1439

(a) 239

(b) 293

(c) 932

(d) None of these

**Answer: (a) 239**

**Explanation:-**

1 x 2 + 1 = 3,

3 x 3 + 2 = 9 + 2

= 11,

11 x 4 + 3 = 44 + 3

= 47,

Same as,

47 x 5 + 4 = 235 + 4

= 239

Then, the missing number is 239.

Hence, the correct answer is option (a) 239.