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laxmi nARAIN ray

· started a discussion

· 1 Months ago

PLS EXPLAIN PROPERLY HOW 18 CAME? (Question: 86182.3 )

PLS EXPLAIN PROPERLY HOW 18 CAME?
REGARDS LN RAY

Question:
DIRECTIONS:- What approximate value should come in place of question mark (?) in each of the following questions?
(13.67)4 = ?
Options:
A) 33315
B) 34900
C) 35800
D) 36300
E) 37815
Solution:
Ans: (b) 
\(13.67\approx13.7,(13.7)^2 \)
\(\approx169+18=187\)
Also, \((187)^2=34969\approx34900\)

Khushboo Singh

· commented

· 1 Months ago

13.7=if we do (13+0.7)'s square we will get 169+0.49+2*0.7*13. From this we will get 169+19(approx).
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