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Assertion : The sum of 278+691+221 is 19...

Assertion : The sum of `278+691+221` is 1901.
Reason : If a, b and c are three whole numbers, then `(a+b)+c=a+(b+c)`.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If assertion is false but reason is true

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