- A14
- B30
- C16
- D15
Step-by-Step Solution
Sn = (first + last) = , so instalments.
Answer: D) 15
A debt of Rs 900 is cleared in monthly instalments that form an AP.
The first instalment is Rs 100 and the last instalment is Rs 20.
How many instalments are there?
Class 10AP Word ProblemsAlgebra — Sequences
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