Subject :NCO Class : Class 4

Subject :NCO Class : Class 1

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Subject :NCO Class : Class 6

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Subject :NCO Class : Class 5

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Class : Class 5

I think 11 is the ans. because it is the only prime number in the given options and 847 is a multiple of 11 bcz 847÷ 11 = 77

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Subject :NCO Class : Class 2

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Subject :NCO Class : Class 6

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Subject :NCO Class : Class 6

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 3

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Subject :NCO Class : Class 5