What should come in place of question mark ’?’ in the following number series? 777, 707, 714, 644, ?

What should come in place of question mark ’?’ in the following number series? 777, 707, 714, 644, ? Correct Answer 651

The pattern of the given series:

(Number) – 70 = next number and alternatively: (number + 7) = next number

⇒ 777 – 70 = 707

⇒ 707 + 7 = 714

⇒ 714 – 70 = 644

⇒ 644 + 7 = 651 = ?

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