Find the missing term in the following series ? 10000, 11000, 9900, 10890, ?, 10781 - 50434

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Deepak Sahoo • 10.60K Points
Tutor II Reasoning

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Q. Find the missing term in the following series ?
10000, 11000, 9900, 10890, ?, 10781

(A) 10423

(B) 9801

(C) 10241

(D) 9712

Correct Answer - Option(B)

Explanation:

Clearly, alternatively we add and subtract 10% of a term to obtain the next term of the series.
Thus, 10000 + (10% of 10000)= 11000;
11000 - (10% of 11000) = 9900;
 9900 + (10% of 9900)  = 10890;
10890 - (10% of 10890) = 9801.
 9801 + (10% of 9801)  = 9801+980 = 10781.
So, missing term = 10890- (10% of 10890)= 9801.

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