Q8. 1, 4, 9, 16, 23, 25, 36
Answer- Option A
Explanation-
Each of the numbers is a perfect square, except 23
Q9. 125, 123, 120, 115, 108, 100, 84
| A. 100 |
B. 115 |
| C. 84 |
D. 108 |
Answer- Option A
Explanation-
Prime numbers 2, 3, 5, 7, 11, 13 are successively subtracted.
So, 100 is wrong. It must be (108 - 11) = 97
Q10. 4, 9, 19, 39, 79, 160, 319
| A. 319 |
B. 19 |
| C. 160 |
D. 39 |
Answer- Option C
Explanation-
Double the number and add 1 to it to get the next number. So, 160 is wrong.
Q11. 8, 27, 125, 343, 1331
| A. 1331 |
B. 125 |
| C. 27 |
D. None of these |
Answer- Option D
Explanation-
The numbers are cubes of primes- 2
3, 3
3, 5
3, 7
3, 11
3 Clearly, none of these is wrong
Q12. 16, 36, 64, 81, 100, 144, 190
| A. 100 |
B. 190 |
| C. 36 |
D. 81 |
Answer- Option B
Explanation-
Each number is the square of a composite number except 190.
Q13. 10, 14, 28, 32, 64, 68, 132
Answer- Option B
Explanation-
Alternatively, we add 4 and double the next.
So, 132 is wrong. It must be (68 x 2 i.e. 136).
Q14. 3, 10, 21, 36, 55, 70, 105
Answer- Option D
Explanation-
The pattern is 1 x 3, 2 x 5, 3 x 7, 4 x 9, 5 x 11, 6 x 13, 7 x 15, etc.
