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Question

Suppose p is the first of n(n>1) AM's between two positive numbers a and b, then value of p is

A
na+bn+1
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B
nabn+1
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C
na+an+1
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D
naan+1
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Solution

The correct option is A na+bn+1
Let A1,A2,.....An be the n AM's to be inserted between a and b
Then, a,A1..........An,b is an AP. Let the common difference be d.
b=a+(n+21)d
d=ban+1
p=A1=a+ban+1
p=an+a+ban1
=an+bn+1

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