Pls answer this with working on the paper
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26. x+1/x=15
x^2+1/x^2
=(x+1/x)^2-2.x.1/x
=(15)^2-2
=225-2
=223
27. square root of 2491
2491| 49
16
89 | 891
801
90
90 students will be left
number of row=49
number if column=49
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