Problem Solving (PS) | Re: There are 24 different four-digit integers than can be

as 24 combination is possible with four digit, each digit gets six numbers. if we add 6 two's, 6 three's, 6 four's, and 6 five's. Which adds up to 84. So the last digit will be 4. Eliminate B.
no the tenth digit will be 84 + 8 = (9)2. Eliminate C
the hundredth digit will be 84+ 9 = (9)3. Eliminate D.
So E is the answer

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