Exercise: Numbers

Questions for: Numbers

{(476 + 424)2 - 4 x 476 x 424} = ?
A:
2906
B:
3116
C:
2704
D:
2904
Answer: C
Given Exp. = [(a + b)2 - 4ab], where a = 476 and b = 424
= [(476 + 424)2 - 4 x 476 x 424]
= [(900)2 - 807296]
= 810000 - 807296
= 2704.
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(1000)9 ÷ 1024 = ?
A:
10000
B:
1000
C:
100
D:
10
Answer: B
Given Exp. = (1000)9 = (103)9 = (10)27 = 10(27-24) = 103 = 1000
1024 1024 1024
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3 + 33 + 333 + 3.33 = ?
A:
362.3
B:
372.33
C:
702.33
D:
702
Answer: B 
    3
+  33
+ 333
+   3.33
  ------
  372.33
  ------
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287 x 287 + 269 x 269 - 2 x 287 x 269 = ?
A:
534
B:
446
C:
354
D:
324
Answer: D
Given Exp. = a2 + b2 - 2ab, where a = 287 and b = 269
= (a - b)2 = (287 - 269)2
= (182)
= 324
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8988 ÷ 8 ÷ 4 = ?
A:
4494
B:
561.75
C:
2247
D:
280.875
Answer: D
Given Exp. = 8988 x 1 x 1 = 2247 = 280.875
8 4 8
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