यदि समान्तर श्रेणी \(c-5,c+1,c+7,\ldots\) का (21)वां पद (139) है तो (c) का मान क्या होगा?

If the (21)st term of the AP \(c-5,c+1,c+7,\ldots\) is (139), what is the value of (c)?

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Correct Answer

B. (24)

Step 1

Concept

Here (d=6). \(139=c-5+20\times6=c+115\), so (c=24).

Step 2

Why this answer is correct

The correct answer is B. (24). Here (d=6). \(139=c-5+20\times6=c+115\), so (c=24).

Step 3

Exam Tip

यहां (d=6)। \(139=c-5+20\times6=c+115\) इसलिए (c=24)।

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Mathematics Answer, Explanation and Revision Hints

यदि समान्तर श्रेणी \(c-5,c+1,c+7,\ldots\) का (21)वां पद (139) है तो (c) का मान क्या होगा? / If the (21)st term of the AP \(c-5,c+1,c+7,\ldots\) is (139), what is the value of (c)?

Correct Answer: B. (24). Explanation: यहां (d=6)। \(139=c-5+20\times6=c+115\) इसलिए (c=24)। / Here (d=6). \(139=c-5+20\times6=c+115\), so (c=24).

Which concept should I revise for this Mathematics MCQ?

Here (d=6). \(139=c-5+20\times6=c+115\), so (c=24).

What exam hint can help solve this Mathematics question?

यहां (d=6)। \(139=c-5+20\times6=c+115\) इसलिए (c=24)।