0 reads0 ratings0 helpful
If (S_n+S_{n-1}=400) and (S_n-S_{n-1}=20), what is (S_n)?यदि (S_n+S_{n-1}=400) और (S_n-S_{n-1}=20), तो (S_n) क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (210)(210)
Adding the two equations gives (2S_n=420), so (S_n=210). When two equations are given, addition is quick.दोनों समीकरण जोड़ने पर (2S_n=420), इसलिए (S_n=210)। दो समीकरण हों तो जोड़ने की विधि तेज होती है।
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
