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Quantitative Aptitude
Divisibility Rule for 7 & 13
10. If the ar...
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10. If the arithmetic mean of n numbers of a series is X and the sum of ( n-1 ) number is k , then nth number is :
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Q.
If the arithmetic mean of n numbers of a series is
¯
¯
¯
x
and the sum of the first (n-1) numbers is k, then the nth number is
Q.
The arithmetic mean of n numbers is
¯
x
the sum of first (n - 1) number is k. The nth number is
Q.
The arithmetic mean of
n
numbers is
x
. If the sum of the first
(
n
−
1
)
numbers is
k
, then the
n
th number is?
Q.
The AM of
n
numbers of a series is
¯
¯¯¯
¯
X
. If the sum of first
(
n
−
1
)
terms is
k
, then the
n
t
h
number is
Q.
Assertion :Between two numbers whose sum is
2
1
6
,
an even number of arithmetic means are inserted. If the sum of these means exceeds their number by unity, then the number of means are
12
Reason: If
a
and
b
are two given numbers and
A
1
,
A
2
,
.
.
.
,
A
n
are
n
arithmetic means between them, then
A
1
+
A
2
+
.
.
.
+
A
n
=
n
(
a
+
b
2
)
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