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Solution


Q.

Number of 4-digit numbers that are less than or equal to 2800 and either divisible by 3 or by 11, is equal to _________ .            [2023]

Ans.

(710)

Number divisible by 3,1002,1005,…,2799

Tn=1002+3(n-1)=2799⇒n=600

Number divisible by 11 are 164

Number divisible by 33 are 54

Total number=600+164-54=710