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Q)

Consider the following nuclear reactions <br> $^{238}_{92} M \to ^x_y N + ^4_2He$ <br> $^x_y N \to ^A_B L + 2 \beta^+$ <br> The number of neutrons in the elements L is


( A ) 144
( B ) 142
( C ) 146
( D ) 144

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