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Series Test Practice Set

19. 3120, ? , 122, 23, 4
A. 488
B. 621
C. 610
D. 732

Answer: Option B
Explanation: 4th term 23 = 5 × 4 + 3 = 23
3rd term 122 = 5 × 23 + 7 = 122
2nd term ? = 5 × 122 + 11 = 621
1st term 3120 = 5 × 621 + 15 =3120

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20. 0, 5, 60, 615,?
A. 6030
B. 6170
C. 6130
D. 6000

Answer: Option B
Explanation:0 → +5 → 5 → +55 → 60 → +555 → 615 → +5555 → 6170

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DIRECTIONS (Qs. 21-25) : A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

दिशानिर्देश (प्रश्न 21-25): निम्नलिखित प्रश्नों में एक श्रृंखला दी गयी है जिसमें एक शब्द गायब है। दिए गए विकल्पों में से सही विकल्प चुनें जो श्रृंखला को पूरा करेंगे।

21. 1, 2, 6, 24, ? ,720
A. 3
B. 5
C. 120
D. 8

Answer: Option C
Explanation:1 × 2 = 2
2 × 3 = 6
6 × 4 = 24
24 × 5 = 120
120 × 6 = 720

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22. 156, 506, ?, 1806
A. 1056
B. 856
C. 1456
D. 1506

Answer: Option A
Explanation:156 + 350 = 506
506 + 550 = 1056
1056 + 750 = 1806

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23. 3, 6, 9, 15, 24, 39, 63, ?
A. 100
B. 87
C. 102
D. 99

Answer: Option C
Explanation:3 + 3 = 6
6 + 3 = 9
9 + 6 = 15
15 + 9 = 24
24 + 15 = 39
39 + 24 = 63
63 + 39 = 120

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24. –1, 0, ?, 8, 15, 24
A. 4
B. 3
C. 2
D. 1

Answer: Option B
Explanation:–1 → +1 → 0 →+3 → 3 → +5 → 8 → +7 → 15 → +9 → 24

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