यदि(a+b)2 = 100 और a:b=1:3 है तो ab ज्ञात करें
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(a+b)^2=100
a+b=10
a:b=1:3
a/b=1/3
b=3a
a+b=10
a+3a=10
4a=10
a=10/4=5/2
b=3.a=3.5/2=15/2
so , ab=5/2.15/2=75/4
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