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Verified answer
8) 84 = 2² × 3 × 763 = 3² × 7
21 = 3 × 7
FPB = 3 × 7 = 21 ( D )
7) 36 = 2² × 3²
48 = 2⁴ × 3
64 = 2^6
kpk = 2^6 × 3² = 64 × 9 = 576 ( D )
6) 70 = 2 × 5 × 7
42 = 2 × 3 × 7
98 = 2 × 7²
FPB = 2 × 7 ( A )