How many days are between Kth day of the Kth week to 2Kth

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How many days are between K^th day of the K^th week to 2K^th day of the 2K^th week

1. 96
2. 92
3. 90
4. None of these

Correct Option: A

Number of days in K weeks is 7K hence total number of days is 7K + K = 8k
Similarly number of days in 2Kth day of the 2Kth week is 2k x 7 + 2k = 16k
Required number of days is 16K - 8K = 8K or number of days must be a multiple of 8.