Number System
What value should come in place of ? in the given number series ? 15, 51, 162, 498, 1509, ?

3434
7878
5656
4545

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Number System
In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

24
46
26
42

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Number System
A number consists of two digits whose sum is 8. If 18 is subtracted from the number, the place of digits get interchanged. Find the number.

35
46
32
53

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