RRB Group-D Model Paper 18 with answers for online practice

Question : 52 of 100

Marks: +1, -0

If x + y = 12 and

x^2 + y^2

= 94, then xy is

Solution:

(x + y)^2

= 122

x^2 + y^2

+ 2xy = 144
94 + 2xy = 144
⇒ xy = (144 – 94)/2 = 25

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