Good question. Generally, in questions where x power is even, the solution has max/min value when we substitute x=0. The reason is, any even power of x will always result in a positive number. Detailed solution goes like this: Assume (x^2) + 2 = a Then, question can be written as a / (a^2 + 1) Simplifying this, we get 1 / [a + (1/a)] Applying A.M-G.M inequality here, we get denominator min. value as 2.5. Hence, max. value for expression is 1/2.5 = 2/5 (Option D) Keep learning and reach out again if you have doubts :)
Sir in Q2 Where 63-23= 40 and the avg increase by 2. 40/2 =20. So there are 20 New terms Old terms were 19 and there avg is 10th term 23. And 20th term is 63. 15th term would be 20th+10th/2 And here is 43. But in description it's 47. Where am I going wrong?
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Which mock is this?
Its actually great to see this
Can you please guide me how to select sets for dilr
Really impressive in VARC
also i guess 11th question is right and while checking score you missed it and took wrong option 130 score Great
QA section felt a bit too easy . Was it ?
Can you please tell how have you solved Quant question 3? Would be very helpful.
Good question. Generally, in questions where x power is even, the solution has max/min value when we substitute x=0. The reason is, any even power of x will always result in a positive number.
Detailed solution goes like this:
Assume (x^2) + 2 = a
Then, question can be written as a / (a^2 + 1)
Simplifying this, we get 1 / [a + (1/a)]
Applying A.M-G.M inequality here, we get denominator min. value as 2.5.
Hence, max. value for expression is 1/2.5 = 2/5 (Option D)
Keep learning and reach out again if you have doubts :)
For minimum value what we need to substitute
Sir in Q2
Where 63-23= 40 and the avg increase by 2. 40/2 =20.
So there are 20 New terms
Old terms were 19 and there avg is 10th term 23. And 20th term is 63. 15th term would be 20th+10th/2
And here is 43. But in description it's 47.
Where am I going wrong?
You're very close!
(n-4)th term would be 16th term, not 15th term.
15th term = (n-5)th term = 43
16th term = (n-4)th term = 47
Hence, answer is 47.
@@99PercentileHubUnderstood. misinterpreted the question.
Thankyou
Can you tell me what should do imrove my varc, i am doing well in dilr and quants but i didn't score well in varc
Please tell me something i should improve my score in varc in these last days