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Answer 1 · 2017-02-19T09:17:53

#a_n = a + (n-1)d#

Here

#a_3=10#

#a_5=26#

On solving, we get

#a+4d=26#

#a+3d=10#

On substituting #a=1#, we get

#d=3#

Therefore,

#a_n = 1 + 3(n-1)#