18th term of A.p. 2, 7, 12,.....
manalnasira:
87
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first term (a) = 2
second term (a2) = 7
common difference (d) = a2 - a = 7 - 2 = 5
to find :- 18th term
using
An = a + (n - 1)d
A18 = 2 + (18 - 1)5
A18 = 2 + 17 × 5 = 2 + 85 = 87
Ans. 18th term = 87
second term (a2) = 7
common difference (d) = a2 - a = 7 - 2 = 5
to find :- 18th term
using
An = a + (n - 1)d
A18 = 2 + (18 - 1)5
A18 = 2 + 17 × 5 = 2 + 85 = 87
Ans. 18th term = 87
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