There are a few possibilities, but 100 is the most likely.
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81
49 equals 72, and the next square number is 82 = 64.
The next number will be 25 because 5 times 5 = 25
36 - The sequence is deducting two from the difference between the two numbers each time.81-64=1764-49=15 therefore49-36=13It is squire of numbers in decending order9*9=818*8=647*7=496*6=36
49, 36, 25...