Three circles, C1, C2, C3 are drawn by taking the sides of acute ΔABC as diameters. If the common chords of C1 and C2, C2 and C3, C1 and C3 meet at a point N inside the triangle and BN extended meets AC at D then find ∠BDA in degrees.
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અશકય ઘટનાની સંભાવના શું
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