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A well costs 150 rupees for the first metre and rises by 50 for each further metre. The cost for the fourth metre is:
A250
B350
C200
D300
Answer & Solution
Correct answer: D. 300
1. The first term is 150 and the difference is 50.
2. Three rises add 150.
3. The cost is 300 rupees.
_Source: NCERT Class 10 Mathematics, Chapter 5, Arithmetic Progressions._
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