2 A B -A B 1 B 1 8Find A- B-

The correct option is B 28 2AB+AB1=B18, (200+10A+B)+(100A+10B+1)=100B+10+8, B+1=8 ⇒ B=7, A+B=1 #160;Equations don't add up A+B= ...

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Standard XII

Mathematics

Sequence

2 A B +A B 1...

Question

$2 A B$
$+ A B 1 - ----- -$
$B 18 - --- -$
Find $A \times B$ .

28

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45

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36

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12

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Solution

The correct option is B $28$
$2 A B + A B 1 = B 18, (200 + 10 A + B) + (100 A + 10 B + 1) = 100 B + 10 + 8,$
$B + 1 = 8 \Rightarrow B = 7,$
$A + B = 1$
Equations don't add up
$A + B = 11 \Rightarrow A = 4$
Therefore, $A \times B = 4 \times 7 = 28$
Hence, the answer is $28$ .

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Question 9
Find the values of the letters in the following and give reasons for the steps involved.
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2AB+AB1––––––– B18–––––Find A×B.

The correct option is B 282AB+AB1=B18,(200+10A+B)+(100A+10B+1)=100B+10+8,B+1=8⇒B=7,A+B=1 Equations don't add upA+B=11⇒A=4Therefore, A×B=4×7=28Hence, the answer is 28.

$2 A B$
$+ A B 1 - ----- -$
$B 18 - --- -$
Find $A \times B$ .

The correct option is B $28$
$2 A B + A B 1 = B 18, (200 + 10 A + B) + (100 A + 10 B + 1) = 100 B + 10 + 8,$
$B + 1 = 8 \Rightarrow B = 7,$
$A + B = 1$
Equations don't add up
$A + B = 11 \Rightarrow A = 4$
Therefore, $A \times B = 4 \times 7 = 28$
Hence, the answer is $28$ .