plz.. solve this question.
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Explanation :
1st set: 20 times, result 2,6,10...till 78
2nd set: 10 times, result 7,23,..till 15q
3rd set : 5 times, results 29,93,157,221,285
4th set: 2 times with remainder 285
5th set: 1 time, results results 377,
6th set, 39th operation (20+10+5+2+1+1) results
377 + 285 - 1 =781