**1.** 3, 5, 7, 12, 17, 19

A. 17✘

B. 12✔

C. 19✘

D. 3✘

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Option: B

### Explanation

12 is not a prime number,others are prime numbers

also, 12 is an even number.

✉ Answer

**2.** 41, 43, 47, 53, 61, 71, 73, 81

A. 81✔

B. 61✘

C. 71✘

D. 41✘

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Option: A

### Explanation

Except 81 others are prime numbers

✉ Answer

**3.**1, 5, 14, 30, 50, 55, 91

A. 14✘

B. 30✘

C. 55✘

D. 50✔

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Option: D

### Explanation

**Ans = 50**

the pattern is 1^{2} = 1

1^{2} + 2^{2} = 5

1^{2} + 2^{2} + 3^{2} = 14

1^{2} + 2^{2} + 3^{2} + 4^{2} = 30

1^{2} + 2^{2} + 3^{2} + 4^{2} + 5^{2} = 55

1^{2} + 2^{2} + 3^{2} + 4^{2} + 5^{2} + 6^{2}=91

here in this pattern, number 50 does not follow the pattern

✉ Answer

**4.**385, 462, 572, 396, 427, 671, 264

A. 671✘

B. 427✔

C. 572✘

D. 264✘

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Option: B

### Explanation

**Ans:427**

Pattern is 2nd Digit = 1st Digit + 3rd Digit

i.e) in the number 427, 2 ≠ 4 + 7

✉ Answer

**5.**835, 734, 642, 751, 853, 981, 532

A. 734✘

B. 981✘

C. 751✔

D. 532✘

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Option: C

### Explanation

**Ans: 751**

Pattern is 2nd Digit = 1st Digit - 3rd Digit

i.e) in the number 751, 5 ≠ 7 - 1.

✉ Answer

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