First second and third terms of a preparation and respectively 4 ,6 and, 8 find its fourth term
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Let the first term be 'a'
& common difference be 'd'
Given
1st term,a = 4
2nd term = 6
3rd term = 8
Common difference,d = 6-4 =8-6 = 2
4th term = a + (4-1)d
= 4 + 3×2
= 4 + 6
= 10
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