Question

The first term of an AP is -2 and the 11th term is 18. Find its 15th term

Answer 1

Answer: 26

Step-by-step explanation:

a = -2

a + 10d = 18

= 18 = -2 + 10d

= 20 = 10d

= d = 2

AP = -2 , 0 , 2 , 4 , .............

15th term = a + 14d

= -2+14*2

= -2+28 = 26

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Answer 2

Answer:

26

Step-by-step explanation:

tn= a+(n-1)d

a= -2 and

t11 = a + 10d

since,t11 = 18

18 = -2 + 10d

d=2

t15 = -2 + (14*2)

t15 = 26