# 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 View / Hide Answer

 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 View / Hide Answer

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 View / Hide Answer

 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 View / Hide Answer

 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 View / Hide Answer

 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 View / Hide Answer