Write the greatest and the smallest 4-digit numbers using four different dig its with the condition as given:(1) Digit 7 is always at units place. (2) Digit 4 is always at ten place. (3) Digit 9 is always at hundred place. (4) Digit 2 is always at thousand place.
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1-greatest- 9867, smallest-1027
2-greatest-9847, smallest-1042
3-greatest-8976, smallest-1902
4- greatest-2987, smallest-2013
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