Explanation

Pattern: 2 duty days, 1 rest day, repeat until 7 duty days are done.  

First duty day = Monday

Let’s list them:

Day 1: Monday → Duty 1  

Day 2: Tuesday → Duty 2  

Day 3: Wednesday → Rest  

Day 4: Thursday → Duty 3  

Day 5: Friday → Duty 4  

Day 6: Saturday → Rest  

Day 7: Sunday → Duty 5  

Day 8: Monday → Duty 6  

Day 9: Tuesday → Rest  

Day 10: Wednesday → Duty 7

The 7th duty day is Wednesday.

Last verified on 11-09-2026

Explanation

The sequence: 18, 24, 30, 36

Check for constant percentage growth = each step should multiply by the same number.

Step 1: 24 / 18 = 1.333... = 33.33% increase  

Step 2: 30 / 24 = 1.25 = 25% increase  

Step 3: 36 / 30 = 1.20 = 20% increase  

The ratios are different: 1.333, 1.25, 1.20  

So the percentage increases are not the same.

Answer: The ratios 24/18, 30/24 and 36/30 differ, so the percentage increases are not constant.

Last verified on 11-09-2026

Explanation

Pattern = Previous × 2 + 1

4 × 2 + 1 = 9

9 × 2 + 1 = 19

19 × 2 + 1 = 39

39 × 2 + 1 = 79

79 × 2 + 1 = 159

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Explanation

Find the differences:

6 − 2 = 4

12 − 6 = 6

20 − 12 = 8

30 − 20 = 10

42 − 30 = 12

The differences increase by 2 each time.

Next difference = 14

42+14=56

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Explanation