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  9. Q84

RBI Grade B Officer (General / DEPR / DSIM) 2023 · Question 84 of 260

Given below are two number series I and II where the missing numbers in series I and II are 'P' and 'Q', respectively. Find the value of 'P' and 'Q' and find which among the given options gives the correct value of (P - Q). I: 5000, 4000, 3000, 2100, P, 819 II: 4, 6, 15, 56, Q, 1644

Number Series

  1. A1. 1120
  2. B2. 1090Correct
  3. C3. 980
  4. D4. 1240
  5. E5. 1050

Answer: B. 2. 1090

Explanation

2 Detailed solution: For series I: 5000 X 0.8 = 4000 4000 X 0.75 = 3000 3000 X 0.7 = 2100 2100 X 0.65 = 1365 1365 X 0.6 = 819 Therefore the value of the missing number 'P' is 1365 For series II: (4 X 2) - 2 = 6 (6 X 3) - 3 = 15 (15 X 4) - 4 = 56 (56 X 5) - 5 = 275 (56 X 5) - 5 = 275 (275 X 6) - 6 = 1644 The value of the missing number 'Q' is 275 So, P - Q = 1365 - 275 = 1090

Source: RBI Grade B 2023 – Phase 1 recollected questions with answer key (EduTap compilation) · memory-based

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