Series (SSC CHSL 2020 Tier – 1)

1. a _ _gb _ _ acegb _ _ aceg _ _ _ [SSC CHSL 12/04/2021 (Morning)]

(a) dfdfbcegb
(b) cedfdfbdf
(c) fdfdbfceg
(d) cefbdfdf

Correct Answer: (b) cedfdfbdf

Solution:The repetitive series is ‘acegbdf’:
acegbdf / acegbdf / acegbdf
cedfdfbdf is the correct answer.

2. 2, 4, 5, 19, 71, ? [SSC CHSL 12/04/2021 (Morning)]

(a) 361
(b) 316
(c) 216
(d) 261

Correct Answer: (a) 361

Solution:2 → 4 → 5 → 19 → 71 → ?
Pattern:

2 × 1 + 2 = 4
4 × 2 - 3 = 5
5 × 3 + 4 = 19
19 × 4 - 5 = 71
71 × 5 + 6 = 361

3. 10, 13, 19, 31, ?, 103 [SSC CHSL 12/04/2021 (Afternoon)]

(a) 73
(b) 61
(c) 49
(d) 55

Correct Answer: (d) 55

Solution:

4. REST, SEST, SFST, ?, SFTU [SSC CHSL 12/04/2021 (Afternoon)]

(a) SFRT
(b) SGTT
(c) SFUT
(d) SFTT

Correct Answer: (d) SFTT

Solution:

5. KO_MCL_QMCMO_M_NOQ_C [SSC CHSL 13/04/2021 (Afternoon)]

(a) M, O, Q, C, O
(b) Q, O, C, M
(c) M, O, Q, C, M
(d) Q, O, Q, C, M

Correct Answer: (d) Q, O, Q, C, M

Solution:The repetitive unit is KOQMC, but the first letter increases by 1 each time.
KOQMC / LOQMC / MOQMC / NOQMC
Correct answer: Q, O, Q, C, M

6. Y_BP _ _ A_PK_AB_KY _ BPK [SSC CHSL 13/04/2021 (Evening)]

(a) Y A K B Y P A
(b) A K Y B Y P K
(c) A K Y B Y P A
(d) A K A Y K P A

Correct Answer: (c) A K Y B Y P A

Solution:The repetitive series is ‘YABPK’:
YABPK / YABPK / YABPK / YABPK is the complete series.

7. 12, 15, 75, ?, 738, 749 [SSC CHSL 13/04/2021 (Evening)]

(a) 90
(b) 82
(c) 259
(d) 155

Correct Answer: (b) 82

Solution:

8. 23, 29, 31, 37, 41, 43, 47, ? [SSC CHSL 15/04/2021 (Morning)]

(a) 59
(b) 49
(c) 53
(d) 51

Correct Answer: (c) 53

Solution:Logic: This is a sequence of prime numbers beginning with 23.
The next prime number will be 53.

9. 45, 49, 57, ?, 105, 169 [SSC CHSL 16/04/2021 (Afternoon)]

(a) 69
(b) 73
(c) 75
(d) 70

Correct Answer: (b) 73

Solution:

10. 14, 28, 31, 124, 129, ? [SSC CHSL 16/04/2021 (Evening)]

(a) 774
(b) 644
(c) 447
(d) 666

Correct Answer: (a) 774

Solution:

Series (SSC CHSL 2020 Tier – 1)

1. a _ _gb _ _ acegb _ _ aceg _ _ _ [SSC CHSL 12/04/2021 (Morning)]

2. 2, 4, 5, 19, 71, ? [SSC CHSL 12/04/2021 (Morning)]

3. 10, 13, 19, 31, ?, 103 [SSC CHSL 12/04/2021 (Afternoon)]

4. REST, SEST, SFST, ?, SFTU [SSC CHSL 12/04/2021 (Afternoon)]

5. KO_MCL_QMCMO_M_NOQ_C [SSC CHSL 13/04/2021 (Afternoon)]

6. Y_BP _ _ A_PK_AB_KY _ BPK [SSC CHSL 13/04/2021 (Evening)]

7. 12, 15, 75, ?, 738, 749 [SSC CHSL 13/04/2021 (Evening)]

8. 23, 29, 31, 37, 41, 43, 47, ? [SSC CHSL 15/04/2021 (Morning)]

9. 45, 49, 57, ?, 105, 169 [SSC CHSL 16/04/2021 (Afternoon)]

10. 14, 28, 31, 124, 129, ? [SSC CHSL 16/04/2021 (Evening)]

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