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720l

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Ho family ——- 1u

Tan family ——- 1u + 12

Chan family ——- (1u + 1u + 12) x 2 = 4u + 24

1u + 1u + 12 + 4u + 24 = 6u + 36 ——- 1080

1u ——- (1080 – 36)/6 = 174

4u + 24 ——- 4 x 174 + 24 = 720

Ans : 720 l.

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