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In an arithmetic progression (AP) the numbers go up by the same step every time. To reach the nth term you take n − 1 steps, not n — that one slip is behind most wrong options. Sums are quick if you pair the first and last terms.
✓ You passed this topic’s test.
Same step every time — “an AP grows by the same amount, so count the steps”
Use it for: Number patterns, savings plans, seating rows and AP questions in Class 8–10 Olympiad papers.
Check: 79 − 3 = 76 = 19 steps of 4, and the 1st term plus 19 steps is the 20th term ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🔗 Sequence Chain badge when you pass — and a certificate when you finish all 13 topics of Part 4 · Class 5–10 problem solving. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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