Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

An app theme has 5 backgrounds, 4 fonts, 6 icons, and 3 layouts. Two specific background-font pairs are invalid. How many valid themes are possible?

Answer and explanation

Correct answer: 324

First count the background-font combinations. Without restrictions, there are 5 × 4 = 20 such pairs. Since 2 specified pairs are invalid, the number of valid pairs is 20 − 2 = 18. Each valid pair can be combined independently with any of 6 icons and any of 3 layouts, giving 6 × 3 = 18 choices for those two components. By the multiplication principle, the total number of valid themes is 18 × 18 = 324. Therefore option C is correct. Option A ignores the invalid pairs and gives 20 × 18. The other options subtract an incorrect quantity or mishandle the independent icon and layout choices.

Related tags

Permutations-And-CombinationsFundamental-PrincipleRestricted-CountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.