Subject :NCO Class : Class 3

Class : Class 4

Arithmetic means addition ,subtraction ,division and multiplication .
That" s why the Ans is A .

Class : Class 3

Elisha the answer is B because there are 3 units in the computer:
1. CU (Control Unit) it controls all the actions in a computer

Subject :NCO Class : Class 3

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 5

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Subject :NCO Class : Class 4

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Subject :NCO Class : Class 6