₹4200 are divided among 'P', 'Q', 'R' and 'S' in such a way that the shares of 'P' and 'Q'. 'Q' and 'R' as well 'R' and 'S' are in the ratios of 2 : 3, 4 : 5 and 6 : 7 respectively the share of 'P' is:

₹600 ₹640 ₹1280 ₹1480

₹640

The correct answer is Option (2) → ₹640