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Can you solve this???? series x

(Guest)

FIND THE NEXT TWO TERMS .....

5 25 61 113 181 ____ _____

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20 Replies

Ankit a shah (Internal auditer) (92 Points)
Replied 03 August 2012

this much quation only

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Hemant Kumar (Accounts Manager MBA (Fin) CMA*) (6450 Points)
Replied 03 August 2012

5 25 61 113 181 265 365

Ankit a shah (Internal auditer) (92 Points)
Replied 03 August 2012

can u explain hemant kumar

Pranav (--) (49 Points)
Replied 03 August 2012

ANSWER IS 263 and 361, I guess.

Odd numbers between 5 and 25 are 9 ,

betwween 25 and 61 are 17 ,

between 61 and 113 are 25

between 113 and 181 are 33

the edifference by which Odd numbers are skipped are 9, 17 ,25 and 33

again difference between 9 ,17 ,25 ,33 is the same that is--- 8.

so the next difference will be 33 +8= 41 and 41+8= 49

therefore

the next 42 th Odd number after 181 comes to 263 and

50 th Odd number after 263 comes to 361.

PLEASE CORRECT ME IF I AM WRONG .

Hemant Kumar (Accounts Manager MBA (Fin) CMA*) (6450 Points)
Replied 03 August 2012

5 + 20 = 25

25 + 36* = 61 *(20+16 =36)

61 + 52* = 113 *(36+16= 52)

113 + 68* = 181 *(52+16= 68)

181 + 84* = 265 *(68+16= 84)

265 +100* = 365 *(84+16=100)

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Ankit a shah (Internal auditer) (92 Points)
Replied 03 August 2012

can u explain hw u got that 20

and if u take 16 than

5+16=21

ur explaination starwit 25 wht abut 5

CA Sonia Vanjani (Assistant Manager Finance) (45 Points)
Replied 03 August 2012

25-5= 20 61-25= 36 113-61= 52 181-113= 68 The gap between d net results of differences is 16 so 68+16=84 Therefore 181+84=265 84+16=100 Therefore 265+100= 365

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Pranav (--) (49 Points)
Replied 03 August 2012

WHAT ABOUT MY ANSWER POSTED ABOVE ,PLEASE ANYONE REPLY .

I HAVE JUST NOW MODIFIED IT FOR A TYPING MISTAKE .

Ankit a shah (Internal auditer) (92 Points)
Replied 03 August 2012

thanks ca sonia

CA Sonia Vanjani (Assistant Manager Finance) (45 Points)
Replied 03 August 2012

Pranav ur considering d odd no. Between dem bt nt d nos. As well ciz dey too are odd nos. As in u wrote btw 5 and 25 is 9 and 5 nd 25 is also odd no.

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CA Sonia Vanjani (Assistant Manager Finance) (45 Points)
Replied 03 August 2012

@ pranav ur considering odd nos. In between nd nt d nos. Coz dey r also odd . I mean to say like u said btw 5 nd 25 there are 9 odd nos. Wat abt 5 nd 25 as well

(Guest)

Originally posted by : Hemant Kumar
	5 + 20 = 25 25 + 36* = 61 (20+16 =36) 61 + 52 = 113 (36+16= 52) 113 + 68 = 181 (52+16= 68) 181 + 84 = 265 (68+16= 84) 265 +100 = 365 *(84+16=100)

This method is the right one I think because finding the number of odd numbers between two numbers is a tricky thing so addition and difference of two consecutive numbers and applying logic is the more appropriate method to solve it.

iit jee syllabus

Pranav (--) (49 Points)
Replied 03 August 2012

@ CA SONIA I agree with you. But let us consider this question from another angle

If we decided to consider EVEN NUMBER ALSO ,Then also EVEN Numbers between 5 and 25 are 10,

again EVEN Numbers between 25 and 61 are 18

again EVEN numbers between 61 and 113 are 26 and so on .

VERY IMPORTNAT THING IS THAT you take odd numbers or even numbers the number or volume of odd or even number will approximately be the same

.So the result is that the difference between 10 and 18 and 26 will AGAIN come to 8.

So I think that The Answer will be the same even when we take EVEN numbers as the base .

CA Sonia Vanjani (Assistant Manager Finance) (45 Points)
Replied 03 August 2012

Well it wud be very tedious to follow such a method... As in the series there is already an easier clue dat d differences need to be increased by 16 ... hemant had posted d correct answer if we folliw d easy route