48. If 1 is subtracted from the last digit of each of the above numbers the sum

Question

48. If 1 is subtracted from the last digit of each of the above numbers the sum of the digits of how many of them are prime numbers?

(1) None (2) Two

(3) One (4) Three

(5) All five

49. If the digits in each of the above numbers are written in reverse order which will be the second highest number?

(1) 251 (2) 359

(3) 487 (4) 526

(5) 972

50. If the positions of the digits of each of the numbers are interchanged such that the first becomes second, second becomes third and third becomes firs, which, of the following will be the highest?

(1) 972 (2) 526

(3) 487 (4) 251

(5) 359

Explanation / Answer

48. (3) 49. (3) 50. (5) n

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