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5. Arithemetic Progressions
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Q14 of 49 Page 112

Find the sum of the odd numbers between 0 and 50

There are 25 odd numbers between 0 and 50


And, we know that


Sum of first n odd numbers = n2.


= 252


= 625


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12

Find the sum of the first 40 positive integers divisible by 6

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Find the sum of the first 15 multiples of 8

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A contract on construction job specifies a penalty for delay of completion beyond acertain date as follows: Rs 200 for the first day, Rs 250 for the second day, Rs 300 for the third day, etc., the penalty for each succeeding day being Rs 50 more than for thepreceding day. How much money the contractor has to pay as penalty, if he has delayedthe work by 30 days?

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A sum of Rs 700 is to be used to give seven cash prizes to students of a school for theiroverall academic performance. If each prize is Rs 20 less than its preceding prize, find thevalue of each of the prizes.

Questions · 49
5. Arithemetic Progressions
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