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Byju's Answer
Standard VIII
Mathematics
Reversing the 2 Digit Numbers and Subtracting Them
32 n+7 is div...
Question
3
2n
+7 is divisible by 8 for all n ∈ N.
Open in App
Solution
Let P(n) be the given statement.
Now,
P
(
n
)
:
3
2
n
+
7
is
divisible
by
8
for
all
n
∈
N
.
Step
1
:
P
(
1
)
=
3
2
+
7
=
9
+
7
=
16
I
t
is
divisible
by
8
.
S
t
e
p
2
:
Let
P
(
m
)
be
true
.
Then
,
3
2
m
+
7
i
s
divisible
by
8
.
T
h
u
s
,
3
2
m
+
7
=
8
λ
for
some
λ
∈
N
.
.
.
.
(
1
)
We
need
to
show
that
P
(
m
+
1
)
is
true
whenever
P
(
m
)
is
true
.
Now
,
P
(
m
+
1
)
=
3
2
m
+
2
+
7
=
3
2
m
.
9
+
7
=
(
8
λ
-
7
)
.
9
+
7
From
(
1
)
=
72
λ
-
63
+
7
=
72
λ
-
56
=
8
(
9
λ
-
7
)
I
t
is
a
multiple
of
8
.
T
h
u
s
,
P
(
m
+
1
)
is
divisible
by
8
.
B
y
t
h
e
p
rinciple
of
m
athema
t
i
cal
induction
,
P
(
n
)
is
true
for
all
n
∈
N
.
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0
Similar questions
Q.
For all
n
∈
N
,
3
2
n
+
7
is divisible by
Q.
3
2
n
+
2
−
8
n
−
9
is divisible by 8 for all n
ϵ
N.
Q.
If
n
∈
N
, then
3
2
n
+
7
is divisible by
Q.
For all
n
∈
N
,
3
2
n
+
2
−
8
n
−
9
is divisible by
Q.
Prove the following by using the principle of mathematical induction for all
n
∈
N
:
3
2
n
+
2
−
8
n
−
9
is divisible by
8
.
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