–1, 0,?, 8, 15, 24

The number pattern is described in the below image. As per figure we can see the number series is in specific pattern which will help us to find the next number. It is clear that we are getting the next terms on adding + 1 , + 3 , + 5 , + 7 , + 9 in previous term respectively.First term = - 1Second term = First term + 1 ⇒ Second term = -1 + 1 = 0 Third term = Second term + 3 ⇒ Third term = 0 + 3 = ( ? ) ∴ ( ? ) = 3Similarly we can calculate the all others terms ⇒ Fourth term = 8 ⇒ Fifth term= 15