alleryFor RD interest, P=₹1,000,n=12,r=6. Using n(n−1) instead of n(n+1) understates interest by
A₹60
B₹390
C₹65
D₹30
Answer & Solution
Correct answer: A. ₹60
Replacing n(n+1) by n(n−1) removes 2n, reducing interest by ₹60.
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