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In a row of boys, if A who is 12th from the left and B who is 14th from the right interchange their positions, A becomes 17th from

By Ruby

In a row of boys, if A who is 12th from the left and B who is 14th from the right interchange their positions, A becomes 17th from the left.
How many boys are there in the row?
31
29
30
25​

About the author
Ruby

*(2a – 5b)² = ?*

1️⃣ 4a² – 10ab + 25
2️⃣ 4a² +10ab + 25
3️⃣ 4a² – 10ab – 25
4️⃣ 4a² + 10ab – 25​

a point charge of q of mass m is placed at centre of a fixed ring of charge Q and radius R. what minimum velocity should be given

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