Interview Maths Puzzle Numerical Ability

How many 4 digit numbers are possible which don't contain 3 or 6 if repetition is allowed?

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Interview Other Question

Suppose you don't know long form CFL but someone show you a CFL lamp & ask is it CFL or CLF ? then how do you explain ? how many 3 digit numbers are formed with all digits that starts with the odd number and ends with even when repetition is allowed?