What will be the next expression in the following series:

3x+y, 5x+2y, 7x+3y, _______

7x+3y

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9x+4y

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4x+9y

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9x+5y

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Solution

The correct option is B
9x+4y

In the above series, the coefficient of x increases by 2 and the coefficient of y by 1

So, the next expression in the series will be

(7+2)x = 9x

and (3+1)y = 4y

So, 9x+4y

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