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if 8,p,q and 26 is an arithmetic progression find the values of p and q

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a = 8
a + d = p ---> 8+d = p
a + 2d = q ---> 8 + 2d = q
a + 3d = 26

3d = 18
d = 6
then p = 8+6 = 14
q = 8+12 = 20

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so 8, 14, 20, 26 form an AS ? YES

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