You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
SRE-109<br />
11.<br />
= 18-10 = 8<br />
(4x 2 ) 2 (2x+1) 2<br />
=<br />
(4x 2 +2x+1) (4x 2 -2x-1)<br />
1+1<br />
(2x) 3 -(1) 3<br />
= (2x-1) (4x 2 +2x+1)<br />
H.C.F. = 4x 2 +2x+1 1<br />
12 1<br />
1 1<br />
13 1<br />
1<br />
1<br />
1<br />
1<br />
1<br />
1<br />
14<br />
15<br />
Let the number of two digits be 10x+y where x is at ten's place and y is at<br />
one's place.<br />
The reverse number = 10y+x<br />
x+y = 11 ………………(i)<br />
10y+x = 10x+y+45 1<br />
x = 3, y = 8 1<br />
Hence the required number = 10x+y = 38 1<br />
Cumulative frequency table<br />
Marks Frequency c.f.<br />
0 - 10<br />
10-20<br />
20-30<br />
30-40<br />
40-50<br />
3<br />
10<br />
15<br />
8<br />
4<br />
3<br />
13<br />
28<br />
36<br />
40<br />
Median class = = 20 th item = (20-30) 1<br />
1<br />
1<br />
Median =<br />
=<br />
⁄<br />
Median = 24.67 1<br />
1<br />
4