please answer Q.3,5,7

Question number 3: option A
Question number 5: option C
Question number 7: option D
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3 (a)
5 (c)
7(b)
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3 A       5C    7D
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Q1 = option c          Q7= option d
Q2= option b           Q8= option d
Q3=option a
Q4= option a
Q5= option c
Q6= option a
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a cube plus b cube
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3 ka a
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3.a
5.c
7.d
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I need help

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3 a
5 c
7 d
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3 = A ; 5 = C; 7 = D
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3.a
5.c.
7.d
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Q3. 637
+362
=999
Option a)
Q5.option c)
Q7.option b)
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3)a
5)c
7)b
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they r correct 
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