2
1. Let U = span {(1, 1, -1), (2, 3, -1), (3, 1, -5)}, V = span {(1, 1, -3), (3, -2, -8), (2, 1, -3)}. Then Un V is
(6) V
(c) {(0,0,0)}
(d) none of these
.
BLE
(a) U
CIT
PART - B
Answers
Answered by
0
Step-by-step explanation:
Answer:
Let the sum of of Ages of 5 boys be = y
ACCORDING TO THE QUESTION
avg.of their ages is 13yrs.
i.e.
\begin{gathered}avg. = \dfrac{sum \: of \: their \: ages}{no \: of \: boys} \\ \\ 13 = \frac{y}{5} \\ \\ y = 13 \times 5 \\ \\ \blue{\Large \boxed{{\boxed{y= 65yrs}}}} \\ \\ \end{gathered}
avg.=
noofboys
sumoftheirages
13=
5
y
y=13×5
y=65yrs
Now
Let
age of 6th boy be = x
Now New avg. becomes 12yrs
i.e.
\begin{gathered} \dfrac{y + x}{6} = 12 \\ \\ y + x = 72 \\ \\ 65 + x = 72 \\ \\ x =72 - 65 \\ \\ \blue{\Large{ \boxed {\boxed{\boxed{\boxed{x = 7yrs}}}}}}\end{gathered}
6
y+x
=12
y+x=72
65+x=72
x=72−65
x=7yrs
So age of 6th boy is 7yrs .
Hence option D is correct
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