Advertisements
Advertisements
Question
Find the eighteenth term of the A.P: 1, 7, 13, 19, ............
Solution
Here a = 1, d = t2 - t1 = 7 - 1 = 6
tn = a + (n - 1) d
t18 = 1 + (18 - 1) (6)
= 1 + 17 (6)
= 1 + 102
t18 = 103
The Eighteenth term is 103
APPEARS IN
RELATED QUESTIONS
Find the sum of all three-digits natural numbers which are divisible by 13.
Find the sum of the following.
`(1 - 1/n) +(1 -2/n) + (1- 3/n) +` ......up to n terms.
In an AP, the first term is 2, the last term is 29 and the sum of all the terms is 155. Find the common difference.
In an AP, the first term is -4, the last term is 29 and the sum of all its terms is 150. Find its common difference.
The 13th terms of an AP is 4 times its 3rd term. If its 5th term is 16, Find the sum of its first 10 terms.
A man arranges to pay off debt of ₹36000 by 40 monthly instalments which form an arithmetic series. When 30 of the installments are paid, he dies leaving on-third of the debt
unpaid. Find the value of the first instalment.
The sum of first 20 odd natural numbers is:
Which of the following sequences are A.P.? If they are A.P. find the common difference.
–10, –6, –2, 2,...
Is the following sequences are A.P.? If is A.P. find the common difference.
0.3, 0.33, 0.333,...
Write the correct number in the given boxes from the following A. P.
1, 8, 15, 22,...
Here a =Here a =
t1 = 
, t2 = 
, t3 = ,
t2 – t1 = – =
t3 – t2 = – = ∴ d =
Write the correct number in the given boxes from the following A. P.
70, 60, 50, 40,...
Here t1 = 
, t2 = , t3 = ,...
∴ a = , d =
Sum of first 55 terms in an A.P. is 3300, find its 28th term.
On 1st Jan 2016, Sanika decides to save Rs 10, Rs 11 on second day, Rs 12 on third day. If she decides to save like this, then on 31st Dec 2016 what would be her total saving?
Multiply : 2`sqrt(12) × sqrt(3)`
The estimated tax on the income of Shreemati Hinduja is Rs. 8000. How much education cess has she to pay at 3% ?
Write a trinomial of degree 7.
Solve : 5m² - 22m-15 = 0
Find tn for the A.P. 3,8,13,18,.....
Find the value of the determinate:
`|(4,-2),(3,1)|`
If for an A.P. the first term is 2 and the common difference is 3, then find first three-term of A.P.
