If number of protons in O-atom are doubled and \( \mathrm{P} \) num...

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If number of protons in O-atom are doubled and
\( \mathrm{P} \)
number of neutrons are decreased to \( 3 / 4 \) th of the
W
original value, new mass of oxygen will be?
(A) 20
(B) 19
(C) 22
(D) 24
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