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In a class of 50 students , 28 opted f...

In a class of 50 students , 28 opted for NCC , 30 opted for NSS and 18 opted both NCC and NSS. One of the students is selected at random . Find the probability that
(i) The student opted for NCC but not NSS .
(ii) The student opted for NSS but not NCC.
(iii) The student opted for exactly one of them .

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