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Q.

Given A→1=2,A→2=3 and A→1+A→2=3. Find the value of A→1+2A→2⋅3A→1−4A→2

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a

-64

b

60

c

-60

d

64

answer is A.

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Detailed Solution

A1=2,A2=3,A→1+A→2=3⇒ A→1+A→22=9⇒ A12+A22+2A→1⋅A→2=9⇒ 22+32+2A→1⋅A→2=9⇒A→1⋅A→2=−2  Now, A→1+2A→2⋅3A→1−4A→2=3A12−8A22+2A→1⋅A→2 =3(2)2−8(3)2+2(−2)=−64
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