Question

which term of AP : 3,8,13,18,...........is 78?​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

T1 = 3, T2 = 8 T3 = 13.......

T2 -T1 = 8-3 = 5

T3 - T2 = 13 -8 = 5

d= 5..... means common difference.

T1 = 3, d = 5, n = 78

tn = a + (n-1) d

t78 = 3+ ( 78- 1) 5

78-3 + ( 78-1)5

75 + (78-1)5

. 75/ 5 = (78-1)

15= 76

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