a) Both A and R are true, and R is the correct explanation
of the assertion
b) Both A and R are true, but R is not the correct
explanation of the assertion.
c) A is true, but R is false.
d) A is false, but R is true.
Assertion: 52 u of He contains 13 atoms.
Reason: 4 u is the mass of 1 atom of He.
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a
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