# 1, 3, 8, 19, 42?

Choose the correct alternative from the given ones that will complete the series.

1, 3, 8, 19, 42?

(a) 89

(b) 84

(c) 82

(d) 70

**Answer: (a) 89 **

**Explanation:-**

1 x 2 + 1 = 2 + 1

= 3,

3 x 2 + 2 = 6 + 2

= 8,

8 x 2 + 3 = 16 + 3

= 19,

19 x 2 + 4 = 38 + 4

= 42.

Same as,

42 x 2 + 5 = 84 + 5

= 89

Then, the next term will be 89.

Hence, the correct answer is option (a) 89.