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Question

The 3rd and 5th terms of an AP are -12 and minus 112 then find its common difference.

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Solution

a3=a+2d
-12=a+2d
a=-12-2d----------(1)
​​​​​​
a5=a+4d
-112=a+4d
From eq (1)
-112=-12-2d+4d
2d=-112+12
2d=-100
d= - 50

​​​​​​

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