A four digit number is to be formed using the digits 1 to 7 All digits of the number are different and repetition is not allowed. 1. How many such numbers can be formed ? 2. How many such numbers are divisible by 4 ?
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why Current is lead 90 degree and voltage is lag 90 degree in a capacitor.? why Current is lag 90 degree and voltage is lead 90 degree in an inductor.?
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