alphanumeric series Model Questions & Answers, Practice Test for ibps po prelims 2023

Directions:

The following questions are based on the five three digit numbers given below:

972 526 487 359 251

Question :21

If the positions of the first and second digits are interchanged which of the following will be third if they are arranged in ascending order?

Answer: (c)

972 ⇒ 792, 526 ⇒ 256,

487 ⇒ 847, 359 ⇒ 539,

251 ⇒ 521

256 < 521 < 539 < 792 < 847

Question :22

If 2 is added to the sum of the digits of each of the above numbers how many will be multiples of 5?

Answer: (a)

9 + 7 + 2 + 2 = 20 (multiple of 5)

5 + 2 + 6 + 2 = 15 (multiple of 5)

4 + 8 + 7 + 2 = 21

3 + 5 + 9 + 2 = 19

2 + 5 + 1 + 2 = 10 (multiple of 5)

Question :23

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?

Answer: (b)

972 – 1 = 971 = 17 (prime), 526 – 1 = 525 = 12,

487 – 1 = 486 = 18, 359 – 1 = 358 = 16,

251 – 1 = 250 = 7 (prime)

17 and 7 are prime numbers.

Question :24

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

Answer: (d)

972 ⇒ 279, 526 ⇒ 625,

487 ⇒ 784, 359 ⇒ 953,

251 ⇒ 152

953 > 784 > 625

Question :25

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 first, which of the following will be the highest?

Answer: (e)

972 ⇒ 297, 526 ⇒ 652,

487 ⇒ 748, 359 ⇒ 935,

251 ⇒ 125

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