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v 17 If a, b, c, d are integers, then what 4-digit number abcd satisfies the equation 4 x abcd = dcba?HOTS] |
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Answer» 4 x abcd = dcbaa should be 1 or 2a is multiple of 4 so should be even so a = 2d>= 8 but being multiple of 4d = 84bc +3 = cbb is odd or must be 1 or 2 so b = 1Last digit of4bc+3is1, so the last digit of4bcis8andc=2orc=7. Hencec=7abcd = 2178 ans thanks now I understand the problem |
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