Can you solve this???? series x

                        5         25       61       113       181      265          365

Diff of above        20        36           52       68         84          100

  Diff of above              16            16       16     16          16

answer is

2*2+1*1=5

4*4+3*3=25

6*6+5*5=61

8*8+7*7=113

10*10+9*9=181

12*12+11*11=265

14*14+13*13=365

It is addition of square of even no. series & odd no. series.

Hi,

5 +5*4 =25

25+(5+4)*4= 25+9*4 = 61

61+(9+4)*4 = 61 +13*4 = 113

113 + (13+4) * 4 = 113+17*4 = 181

181 + (17+4)*4 = 181+21*4=265

265 + (21+4)*4=265+25*4=365

(1^2)+(2^2)=5

(3^2)+(4^2)=25

(5^2)+(6^2)=61

(7^2)+(8^2)=113

(9^2)+(10^2)=181

(11^2)+(12^2)=265

(13^2)+(14^2)=365

^ repesents power

Originally posted by : CA Sonia Vanjani
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
correct.

 

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