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Explanation:

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AC = ED = 7.6 and AB = 6.4
From the given diagram ; BC= 7.62 – 6.42 = 16.8
∴ BC ≈ 4.1 m
When the ladder slips 1.2 m, its top edge would be at D at a height of 4.1 – 1.2 ≈ 2.9 m
∴ BE= 7.62 – 2.92 ≈ 49
∴ BE ≈ 7
∴ Ladder shifts approximately 7 – 6.4 = 0.6 m.
Hence, option (b).

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