4 7 12 19 28 A 52 A 2 – 4 = ?

The given series is in the below pattern,
First term = 4
Second term = First term + 3
⇒ Second term = 4 + 3 = 7
Third term = Second term + 5
⇒ Third term = 7 + 5 = 12
Fourth term = Third term + 7
⇒ Fourth term = 12 + 7 = 19
Fifth term = Fourth term + 9
⇒ Fifth term = 19 + 9 = 28
Sixth term = Fifth term + 11
⇒ Sixth term = 28 + 11 = A
∴ A = 39
So, 39 will come in place of A.
Similarly , we can find all others terms also.
now , A² – 4 = 39² – 4 = 1517
Hence ? = 1517