In each of the following questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern.
1, 9, 25, 49, ?, 121
Answer: B
Explanation:
The given series consists of squares of consecutive odd numbers
So, missing term = square of 9 = 81.
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1, 9, 25, 49, 81, ?
Answer: C
Explanation:
The series consists of squares of consecutive odd number
So, missing term = square of 11 = 121.
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28, 33, 31, 36, ?, 39
Answer: B
Explanation:
The pattern is + 5, - 2, + 5, - 2,.....
So, missing term = 36 - 2 = 34.
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In the series 3, 9, 15, ...... what will be the 21st term?
Answer: C
Explanation:
Clearly, 3 + 6 = 9, 9 + 6 = 15,.....
So, the series is an A.P. in which a = 3 and d = 6.
Therefore 21st term = a + (21 - 1) d = a + 20d = 3 + 20 x 6 = 123.
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66, 36, 18, ?
Answer: C
Explanation:
Each term in the series is the product of the digits of the preceding term.
So, missing term = 1 x 8 = 8.
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11, 13, 17, 19, 23, 29, 31, 37, 41, ——
Answer: A
No answer description available for this question.
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4, 9, 13, 22, 35, ——
Answer: A
No answer description available for this question.
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90, 380, 870, 1560,…..
Answer: B
Solution. (b) The series is 102 – 10, 202 – 20, 302 – 30, etc.
The next number is 502 – 50 = 2450
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2, 10, 30, 68,….222
Answer: A
The series is 13 + 1, 23 + 2, 33 + 3, etc.
The next number is 53 + 5 = 130
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0, 7, 26, 63, 124,…
Answer: D
The series is 13 – 1, 23 – 1, 33 – 1, etc.
The next number is 63 – 1 = 215
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