66. A four digits number a b c d is divisible by 11 if
only
(a)(a + b)(c + d) is divisible by 11
(b) ( c) (b + d) is divisible by 11
(e) (a - c)-(b-d) is divisible by 11
(d) (b + d)-(a + c) is divisible by 11
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Step-by-step explanation:
Ans:(d) (b+d)-(a+c) is divisible by 11
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the answer is D i.e. (b+d)-(a+c) is divisible by 11
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