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RINKU

· started a discussion

· 1 Months ago

ERROR (Question: 88893.2 )

PLEASE PROVIDE SOLUTION TRICK

Question:
DIRECTIONS: What will come in place of question mark (?) in the following question ? 
\(\cfrac{(1.5)^3+(4.7)^3+(3.8)^3-3\times1.5\times4.7\times3.8}{(1.5)^2+(4.7)^2+(3.8)^2-1.5\times4.7-3.8\times4.7-3.8\times1.5}\)             = ?
Options:
A) 0
B) 1
C) 10
D) 30
E)

None of these

Solution:
Ans: (c) 

Knowledge Expert

· commented

· 1 Months ago

Consider a=1.5, b=4.7 and c=3.8

Knowledge Expert

· commented

· 1 Months ago

Just apply the formula: a3+b3+c3-3abc=(a+b+c)(a2+b2+c2-ab-bc-ca) and get the answer in 8 seconds
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