(6) सफेद और (4) काले समान गेंदों को पंक्ति में कितने तरीकों से रखा जा सकता है यदि कोई दो काली गेंदें साथ न हों?
In how many ways can (6) identical white balls and (4) identical black balls be arranged in a row if no two black balls are adjacent?
Explanation opens after your attempt
D. (35)
Concept
Place the (6) white balls first, creating (7) gaps, and choose (4) of them for black balls. With identical objects, only position selection is needed.
Why this answer is correct
The correct answer is D. (35). Place the (6) white balls first, creating (7) gaps, and choose (4) of them for black balls. With identical objects, only position selection is needed.
Exam Tip
पहले (6) सफेद गेंदें रखें, उनसे (7) अंतराल बनेंगे और उनमें से (4) में काली गेंदें रखें। समान वस्तुओं में केवल स्थान-चयन करना होता है।
Login to save your score, XP, coins and progress.
