Question

Complete the series:

10, 19, 40, 77, 158, .....

• A. 311
• B. 307
• C. 301
• D. 299
• E. 297

Answer 1

The correct option is A 311

It follows a pattern :

$10\times 2-1=19$,

$19\times 2+2=40$,

$40\times 2-3=77$,

$77\times 2+4=158$.

So, the next number is $158\times 2-5=311$.