Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 171-180 of 600 questions.
If \(S_n=666\), what will be the value of \(S_{n+2}\)?
B. (741)
\(S_{36}=666\) इसलिए \(S_{38}=666+37+38=741\)। दो आगे जाने पर अगले दो पद जोड़ें। / \(S_{36}=666\), so \(S_{38}=666+37+38=741\). To move two steps ahead, add the next two terms.
Login to save your score, XP, coins and progress.
A. (2556)
\(S_{71}=S_{72}-72=2628-72=2556\) है। पिछले योग के लिए अंतिम पद घटाएं। / \(S_{71}=S_{72}-72=2628-72=2556\). For the previous sum, subtract the last term.
Login to save your score, XP, coins and progress.
What will be the value of \(S_{24}+S_{26}\)?
B. (651)
\(S_{24}=300\) और \(S_{26}=351\) इसलिए योग (651) है। समान दिखने वाले सूचकांकों को ध्यान से पढ़ें। / \(S_{24}=300\) and \(S_{26}=351\), so the sum is (651). Read similar-looking indices carefully.
Login to save your score, XP, coins and progress.
If \(1+2+3+\cdots+n=1176\), what is the value of (n)?
C. (48)
\(S_{48}=\frac{48\times49}{2}=1176\) इसलिए (n=48) है। उत्तर को सूत्र में वापस रखकर सत्यापित करें। / \(S_{48}=\frac{48\times49}{2}=1176\), so (n=48). Verify the answer by substituting it back in the formula.
Login to save your score, XP, coins and progress.
B. (210)
कुल अंक \(S_{20}=210\) होंगे। (0) अंक वाले चरण योग को नहीं बदलते। / The total score is \(S_{20}=210\). Stages with (0) marks do not change the sum.
Login to save your score, XP, coins and progress.
What is the sum of the first (63) natural numbers?
B. (2016)
\(S_{63}=\frac{63\times64}{2}=2016\) है। (64) को आधा करके (32) से गुणा करें। / \(S_{63}=\frac{63\times64}{2}=2016\). Halve (64) and multiply by (32).
Login to save your score, XP, coins and progress.
What is the value of \(S_{44}-S_{30}\)?
A. (525)
\(S_{44}=990\) और \(S_{30}=465\) इसलिए अंतर (525) है। यह (31) से (44) तक का योग है। / \(S_{44}=990\) and \(S_{30}=465\), so the difference is (525). This is the sum from (31) to (44).
Login to save your score, XP, coins and progress.
If the sum of the first (n) natural numbers is (1540), what will (n) be?
C. (55)
\(S_{55}=\frac{55\times56}{2}=1540\) इसलिए (n=55) है। बड़े योग में \(2S_n\) देखकर पहचानें। / \(S_{55}=\frac{55\times56}{2}=1540\), so (n=55). For a large sum, identify using \(2S_n\).
Login to save your score, XP, coins and progress.
Which sum is formed when (38) and (39) are added to \(1+2+3+\cdots+37\)?
C. \(S_{39}\)
\(1+2+\cdots+37+38+39=S_{39}\) होता है। लगातार नए पद जोड़ने पर अंतिम पद नया (n) बनता है। / \(1+2+\cdots+37+38+39=S_{39}\). When consecutive new terms are added, the last term becomes the new (n).
Login to save your score, XP, coins and progress.
B. (1225)
कुल बचत \(S_{49}=\frac{49\times50}{2}=1225\) रुपये है। नियमित (1) की वृद्धि \(S_n\) देती है। / Total saving is \(S_{49}=\frac{49\times50}{2}=1225\) rupees. A regular increase of (1) gives \(S_n\).
Login to save your score, XP, coins and progress.
Use Google login or mobile OTP. Admin can block users and control login providers.