Q64.A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from the start of service will be Rs. 11040 after (1) 19 months (2) 20 months (3) 21 months (4) 18 months
What This Question Tests
The problem requires setting up the saving pattern as a sum of a fixed amount for initial months and then an arithmetic progression for subsequent months. It involves solving a quadratic equation to find the total number of months.
Concepts Tested
Formulas Used
Sn = n/2 * (2a + (n-1)d)
📚 NCERT Sections This Tests
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📋 Question Details
- Chapter
- Sequences & Series
- Topic
- Arithmetic Progression (AP)
- Year
- 2011
- Shift
- Unknown
- Q Number
- Q64
- Type
- MCQ
- NCERT Ref
- Class 11 Mathematics Ch 9: Sequences and Series
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