What should come in place of the question mark (?) in the given series?
679, 680, 684, 693, 709, ?

679, 680, 684, 693, 709, ?

Logic: Differences are perfect squares of natural numbers: 1², 2², 3², 4²

680 − 679 = 1,

684 − 680 = 4,

693 − 684 = 9,

709 − 693 = 16
So the next difference should be:
5² = 25

So, 709 + 25 = 734

Thus, the correct option is (c).