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Question

Find a,b such that 7.2,a,b,3 are in AP.

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Solution

Given 7.2,a,b,3 are in A.P
7.2,a,b are in A.P
2a=7.2+bb=2a7.2
and also a,b,3 are in A.P
2b=a+32(2a7.2)=a+3
4a14.4=a+3
3a=17.4a=5.8
b=2(5.8)7.2=11.67.2=4.4

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