Which term of an AP: -2, 3, 8,……. is 68 ?
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-2 ,3 ,8,...... are in the a.p
a = -2 , d = 5 , tn = 68
since ,
tn = a + ( n-1 )d
68 = -2 + ( n - 1 )5
68 = -2 + 5n - 5
68 = 5n + ( -7 )
68 = 5n - 7
68 + 7 = 5n
75 = 5n
75/5 = n
15 = n
n = 15
hope its helpful
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