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Choose the correct alternative from those given below each question:
What is the sum of first n natural numbers?

A

[n(n-1)]/2

B

[n(n+1)]/2

C

n/2(n-2)

D

[n(n+2)]/2

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NAVNEET PUBLICATION-ARITHMETIC PROGRESSION-EXERCISE
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  2. How many numbers are there from 10 to 300 which when divided by 4 lea...

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  12. Choose the correct alternative: For an A.P., t1=2, tn=41 and Sn=860....

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  17. Choose the correct alternative: The first term of an A.P. is 1 and n...

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  18. Find the first terem of the sequence: tn=3n+1

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  19. Find the first terem of the sequence: tn1/n^2-1

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  20. Find the first terem of the sequence: tn=4n-3

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