If $ f(2 x+3 y, 2 x-7 y)=20 x $, then $ f(x, y) $ equals

JEE MATHEMATICS MCQ: FUNCTIONS

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Application +4 | -1

f(2 x+3 y, 2 x-7 y)=20 x

, then

f(x, y)

equals

View answer and explanation

Correct option: B

7 x+3 y

Option B (

{ }^9 {C}_5

) is correct because it is the difference between the number of 5-digit numbers with digits in descending order and the number of 5-digit numbers with digits in ascending order.

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