Hi!
Let's try to find the pattern.
Is it adding?
2, + 8 = 10, + 8 = 18
Nope. 10 + 8 = 18, not 50.
Is it subtracting?
2 - (-8) = 10 - (-8) = 18
Nope. 10 - (-8) = 18, not 50.
Is it multiplying?
2 x 5 = 10 x 5 = 50
Yes! Now continue the pattern.
50 x 5 = 250 x 5 = 1250
The sequence is
2, 10, 50, 250, 1250
Hope this helps! :)
-Peredhel