The sum of the first four terms of an AP is 28 and sum of the first eight terms

The sum of the first four terms of an AP is 28 and sum of the first eight terms of the same AP is 88. Sum of first 16 terms of the AP is

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1) In a certain AP, 5 times the 5th term is equal to 8 times the 8th term, then its 13th term is equal to

2) 2,4,6,8,10,12,… is

3) If the first term of an AP is 2 and common difference is 4, then sum of its first 40 terms is

4) An AP consist of 31 terms if its 16th term is m, then sum of all the terms of this AP is

5) A number 15 is divided into three parts which are in AP and sum of their squares is 83. The smallest part is