Q.20. The other numbers in Pythagorean triplet whose one number is 18 are O a) 70,81 O b) 60,72 O c) 6290 O c) 80,82
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Step-by-step explanation:
2k, (k
2
+1) and (k
2
−1) form a Pythagorean triplet for any number, k > 1
Let 2k=18
Hence, k=9
and, k
2
+1=9
2
+1=81+1=82
and, k
2
−1=9
2
−1=81−1=80
Check the answers: 18
2
+80
2
=324+6400=6724=82
2
Hence, the triplet is 18,80,82
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