** Test Your Skills **

A)The sum of fourth and twelth term of an AP is 20. What is the sum of the first 15 terms of the AP?

B)In the first 1000 natural numbers, how many integers exist such that they leave a remainder 4 when divided by 7, and a remainder 9 when divided by 11?

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Answers | ||||
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A) 150 | (B) 13 |