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Navendra Kumar

· started a discussion

· 1 Months ago

solution

Question:

  

Options:
A)

8

B)

13

C)

15

D)

17

Solution:

Ans: (b)


ramu

· commented

· 1 Months ago

(a+b)^2-c^2=26
(a+b-c)*(a+b+c)=26
similarly
(b+c-a)*(a+b+c)=67
(c+a-b)*(a+b+c)=76
adding 3 eqns
(a+b+c)*(a+b+c)=26+67+76=169
a+b+c=13

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