26.  3897*999 =?


3883203
3893103
3897503
3791203


Answer

 Option

3897 * 999 = 3897 * (1000 - 1) = 3897*1000 - 3897*1 = 3897000 - 3897 = 3893103.

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27.  3 + 33 + 333 + 3.33 = ?


362.3
372.33
702.33
702


Answer

 Option

3 + 33 + 333 + 3.33 = 372.33

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28.  666 / 6 / 3 =?


37
333
111
84


Answer

 Option

Given exp = 666 * 1/6*1/3 = 37.

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29.  1904*1904 =?


3654316
3632646
3625216
3623436


Answer

 Option

1904*1904 = (1904)^2 = (1900 + 4)^2 =(1900)^2 + 4^2 + 2 * 1900*4 =3610000 + 16 + 15200 = 3610016 + 15200 = 3625216.

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30.  287*287 + 269*269 - 2*287*269 =?


534
446
354
324


Answer

 Option

Given exp = a^2 + b^2 - 2ab, where a = 287 and b = 269 = (a-b)^2 = (287 - 269)^2 = (18)^2 = 324.

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