Pls help me solve these problems . Also give an optimized solution for it .

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Pls help me solve these problems . Also give an optimized solution for it .

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Surya Pratap Rana 11 months ago

d answer

Pls help me solve these problems . Pls give an optimized solution with the answer.

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shubham bharti 1 year ago

Option D

If sum of first 4 terms of an AP is one-fifth the sum of the first 9 terms of the AP, what is the ratio of the first term of the AP to its common difference?

- A 20:11
- B 25:11
- C 50:11
- D 06:11

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solution for this plz.

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Abhijith 1 year ago

but it does not wen x =2

Question 20

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himanshu 1 year ago

let the nos be a and b now GM(a,b)=root(ab) and HM(a,b)=2/(1/a+1/b)=2ab/(a+b). Now root(ab)/(2ab/(a+b)) or 1/2*(root(a/b)+root(b/a))=13/12 or root(a/b)+root(b/a)=13/6 so its clear that option C fits the given condition i.e a/b=4:9.

If the square of the 7th term of an arithmetic progression with positive common difference equals the product of the 3rd and 17th terms, then the ratio of the first term to the common difference is

- A 2:3
- B 3:2
- C 3:4
- D 4:3

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35 Attempts
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#QuestionoftheDay

A sprinter starts running on a circular path of radius r metres. Her average speed (in metres/minute) is pi*r during the first 30 seconds, pi*r/2 during next one minute, pi*r/4 using next 4 minutes, and so on.

What is the ratio of the time taken for the nth round to that for previous round?

- A 4
- B 8
- C 16
- D 32

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17 Attempts
3 Comments

#QuestionoftheDay

The integers 1, 2, …, 40 are written on a blackboard. The following operation is then repeated 39 times: In each repetition, any two

numbers, say a and b, currently on the blackboard are erased and a new number a + b–1 is written. What will be the number left on the board at the end?

- A 820
- B 821
- C 781
- D 819
- E 780

19 Attempts
3 Comments

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