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The sum of first n natural numbers is gi...

The sum of first n natural numbers is given `1/2 n^2 +1/2n`. Find
(i) The sum of first 5 natural numbers.
(ii) The sum of first 11 natural numbers.
(iii) The sum of natural numbers from 11 to 30.

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NCERT EXEMPLAR-ALGEBRAIC EXPRESSIONS-Exercise
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  2. In a rectangular plot, 5 square flower beds of side (x+2) metres each ...

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  3. A wire is (7x - 3) metres long. A length of (3x - 4) metres is cut for...

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  4. A wire is (7x - 3) metres long. A length of (3x - 4) metres is cut for...

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  5. Rohan's mother gave him 3xy^2 and his father gave him 5(xy^2 +2). Out ...

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  6. A triangle is made up of 2 red sticks and 1 blue sticks length of a...

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  7. The sum of first n natural numbers is given 1/2 n^2 +1/2n. Find (i...

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  8. The sum of squares of first n natural numbers is given by 1/6 n (n+1)(...

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  9. The sum of the multiplication table of natural number 'n' is given by ...

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  10. Translate each of the following algebraic expressions into words 4b-...

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  11. 8(m+5)

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  12. Solve the equation, 7/(8-x)=2/3

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  13. Solve the equation, 17/(w+3)=16/(w+1)

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  14. Write the algebraic expression for the word phrase " 1/4 of the sum of...

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  15. What's the Error? A student wrote an algebraic expression for “5 less ...

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  16. Write About it Shashi used addition to solve a word problem about the ...

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  17. Write an expression for the sum of 1 and twice a number n. If you let ...

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  18. Will the value of 11x for x = -5 be greater than 11 or less than 11? E...

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  19. Match Column I with Column II in the following:

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  20. Express the following properties with variables x, y and z. (i) Comm...

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