common.or
auth.dont_have_account auth.register
AB = 3 BC = 5 CD = 7 হলে, AD = কত?
AB = 3(1 + 2 = 3)
BC = 5(2 + 3 = 5)
CD = 7(3 + 4 = 7)
∴ AD = 1 + 4 = 5 (Ans)
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