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Question

This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Sum of first n-natural numbers is n(n+1)2.
A : प्रथम n-प्राकृत संख्याओं का योगफल n(n+1)2 है।

R : Sum of first n-terms of an AP is n2[2a+(n1)d].
R : समान्तर श्रेणी के प्रथम n-पदों का योगफल n2[2a+(n1)d] है।

A
Both (A) and (R) are true and (R) is the correct explanation of (A)

(A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
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B
Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
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C
(A) is true but (R) is false

(A) सही है लेकिन (R) गलत है
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D
(A) is false but (R) is true

(A) गलत है लेकिन (R) सही है
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Solution

The correct option is A Both (A) and (R) are true and (R) is the correct explanation of (A)

(A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
Solution

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Sum of 'n' Terms of an Arithmetic Progression
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