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kumar mallu

· started a discussion

· 1 Months ago

sol

Question:

     If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ? /

Options:
A)

 161

B)

 139

C)

 153

D)

 147

Solution:


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