(9) विषयों में से (4) विषय चुनने हैं। रसायन अवश्य चुना जाए लेकिन गणित और भौतिकी दोनों साथ में न चुने जाएं। कितने तरीके हैं?
From (9) subjects (4) subjects are to be selected. Chemistry must be selected but mathematics and physics must not both be selected together. How many ways are there?
Explanation opens after your attempt
B. (50)
Concept
Chemistry is fixed so choose the remaining (3) subjects from (8). Removing (6) selections containing both mathematics and physics leaves (50) ways.
Why this answer is correct
The correct answer is B. (50). Chemistry is fixed so choose the remaining (3) subjects from (8). Removing (6) selections containing both mathematics and physics leaves (50) ways.
Exam Tip
रसायन तय है इसलिए बाकी (3) विषय (8) में से चुनेंगे। गणित और भौतिकी दोनों साथ वाले (6) चयन हटाने पर (50) तरीके बचते हैं।
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