Aspire Faculty ID #13914 · Topic: JAMIA MILLIA ISLAMIA MCA 2020 · Just now
JAMIA MILLIA ISLAMIA MCA 2020

In a row, A is in the 11th position from the left and B is in the 10th position from the right. If A and B interchange their positions, then A becomes 18th from the left. How many persons are there in the row other than A and B?

Solution

Let total persons = $n$. B’s position from right = 10 ⇒ from left = $(n - 9)$. After interchange, A’s new position = 18 = $(n - 9)$. So, $n = 27$. Total persons other than A and B = $27 - 2 = 25$.

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