Question

7th and 13th term of an AP be 34&64 respect then its 18th term is.
1. 87.
2. 88
3. 89
4. 90​

Answer 1

Answer:

7th term of A.P = a + 6d =34 .....(1)

13th term of A.P = a +12d = 64....(2)

(2) - (1)

6d = 30

d =5

put d =5 in equation (1)

a +30 = 34

a = 4

18th term = a + 17 d = 4 + 17 ×5 = 4 +85 =89

3 option is correct

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Answer 2

Answer:

OPTION 3

Step-by-step explanation:

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