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Find the sum of first n even numbers....

Find the sum of first n even numbers.

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The correct Answer is:
`= (n)/(2) [ 4+ 2n-2] = (n)/(2) [ 2+ 2n] = n(n+1)`.
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If the sum of first term of an A.P is 49 and that of 17 terms is 289. Find the sum of first "n" terms. OR The sum of the third and seyenth terms of an AP is 6 and their product is 8. find the sum of first sixteen terms of the A.P.

ZEN PUBLICATION-ARITHMETIC PROGRESSIONS-ZEN ADDITIONAL QUESTIONS (SHORT-ANSWER [SA] TYPE 1 - QUESTIONS)
  1. The 7th term of an AP is 32 and 13th term is 62. Find the progression.

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  2. In an AP, the 6th term is 12 and 8th term is 22. Find the nth term.

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  3. Which term of the AP 5, 15, 25 is 150 more than its 12th term?

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  4. In an AP, the 18th term is 20 more than the 13th term. If the fourth t...

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  5. Find the common difference of the AP in which 18th term is 10 less tha...

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  6. The 24th term of an AP is twice its 10th term. Show that 72nd term is ...

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  7. Find the sum of first: a] 13 term of AP 2, 6, 10, 14, ..... b] 20 ...

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  8. Find the sum of a] first 10 multiples of 8 b] first 25 multiples o...

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  9. Find the sum of i] 41, 36, 31, ....... upto 10 terms ii] -26, -24,...

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  10. Find the sum of first n odd natural numbers.

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  11. Find the sum of first n even numbers.

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  12. For what values of n, the nth terms of the following sequences are equ...

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  13. Determine k such that (3k - 2), (4k - 6) and (k + 2) are three consecu...

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  14. How many two digits numerals are divisible by 6?

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  15. The first and last terms of an AP are 7 and 49. How many terms make th...

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  16. Which term of an AP 3, 8, 13, 18, ..... will be 55 more than 20th term...

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  17. Find the common difference of an AP whose first term is 4, last term i...

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  18. Three numbers which are in AP together make a 39 and their product is ...

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  19. The four sides of a quadrilateral form an AP, taken in order. The diff...

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  20. Find the Sum of 5+8+11+....to 10 terms using formula.

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