Questions

Assertion (A) & Reason (B) MCQ

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4 questions · timed · auto-graded

Question 11 Mark
Assertion (A) : Sum of natural numbers up to 100 is 5000 .
Reason (R) : Sum of first $n$ natural numbers is given by $\frac{n(n+1)}{2}$.
Answer
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Question 21 Mark
Assertion (A) : In the AP, 10, 6, 2, $\ldots\ldots$ -42 , the number of terms is 14.
Reason (R) : For an AP, $a, a+d, a+2 d, \ldots \ldots l$, the $n$th term from the end is given by $l-(n-1) d$.
Answer
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Question 31 Mark
Assertion (A) : The sum of first $n$ terms of an AP is given by $S _n=2 n^2-5 n$. The common difference of the AP is 4 .
Reason (R) : Sum of first $n$ terms of an AP is given by $S _n=\frac{n}{2}(a+l)$.
Answer
Self
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Question 41 Mark
Assertion (A) : The 20th term of the AP 5, 8, 11, $\ldots$ is 285.
Reason (R) : For an AP, the $n$th term is given by $T _n=a-(n+1) d$.
Answer
Self
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Assertion (A) & Reason (B) MCQ - Mathematics STD 10 Questions - Vidyadip