(11) विषयों में से (5) विषय चुनने हैं। रसायन अवश्य चुना जाए, जीवविज्ञान न चुना जाए और गणित तथा भौतिकी दोनों साथ में न चुने जाएं। कितने तरीके हैं?

From (11) subjects (5) subjects are to be selected. Chemistry must be selected, biology must not be selected, and mathematics and physics must not both be selected together. How many ways are there?

Explanation opens after your attempt
Correct Answer

A. (105)

Step 1

Concept

Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (9) and subtract \(\binom{7}{2}\) selections containing both mathematics and physics to get (105).

Step 2

Why this answer is correct

The correct answer is A. (105). Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (9) and subtract \(\binom{7}{2}\) selections containing both mathematics and physics to get (105).

Step 3

Exam Tip

रसायन तय और जीवविज्ञान हट गया है। बाकी (4) विषय (9) में से चुनें और गणित-भौतिकी दोनों वाले \(\binom{7}{2}\) चयन घटाएं तो (105) मिलते हैं।

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Mathematics Answer, Explanation and Revision Hints

(11) विषयों में से (5) विषय चुनने हैं। रसायन अवश्य चुना जाए, जीवविज्ञान न चुना जाए और गणित तथा भौतिकी दोनों साथ में न चुने जाएं। कितने तरीके हैं? / From (11) subjects (5) subjects are to be selected. Chemistry must be selected, biology must not be selected, and mathematics and physics must not both be selected together. How many ways are there?

Correct Answer: A. (105). Explanation: रसायन तय और जीवविज्ञान हट गया है। बाकी (4) विषय (9) में से चुनें और गणित-भौतिकी दोनों वाले \(\binom{7}{2}\) चयन घटाएं तो (105) मिलते हैं। / Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (9) and subtract \(\binom{7}{2}\) selections containing both mathematics and physics to get (105).

Which concept should I revise for this Mathematics MCQ?

Chemistry is fixed and biology is excluded. Choose the remaining (4) subjects from (9) and subtract \(\binom{7}{2}\) selections containing both mathematics and physics to get (105).

What exam hint can help solve this Mathematics question?

रसायन तय और जीवविज्ञान हट गया है। बाकी (4) विषय (9) में से चुनें और गणित-भौतिकी दोनों वाले \(\binom{7}{2}\) चयन घटाएं तो (105) मिलते हैं।