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Sum of First n Natural Numbers

Sum of first ...

Question

Sum of first 4 terms of an AP whose first term is 2 and fourth is term 6 is ____.

A

10

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B

14

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C

12

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D

16

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Solution

The correct option is D 16

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Find the sum of first n terms of an AP Whose nth term is (5-6n). Hence, find hte sum of its first 20 terms.

Q. Find the sum of first n terms of an AP whose nth term is (5 − 6n). Hence, find the sum of its first 20 terms.

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T_{20} = - 112

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