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  4. Number of 7 digit telephone numbers that can be created if the first three digits must be 426, 427 or 428 and the right most digit is divisible by 3, is k thousand then k is equal to

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Q. Number of 7 digit telephone numbers that can be created if the first three digits must be 426, 427 or 428 and the right most digit is divisible by 3, is k thousand then k is equal to

Permutations and Combinations

Solution:

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$(3) \left(10^3\right)(4)$
$\Rightarrow(12) 10^3 $
$\Rightarrow k =12$