Advertisements
Advertisements
प्रश्न
Find the 19th term of the following A.P.:
7, 13, 19, 25, ...
Advertisements
उत्तर
The given sequence is 7, 13, 19, 25, ....
Here,
First term = a = t1 = 7, t2 = 13, t3 = 19, t4 = 25, ....
Common difference = d = t2 − t1
= 13 – 7
= 6
To find the 19th term, we have to use the formula, i.e.,
tn = a + (n − 1)d
∴ t19 = 7 + (19 − 1) × 6 ...(On substituting value)
= 7 + 18 × 6
= 7 + 108
= 115
Hence, the 19th term of the progression is 115.
APPEARS IN
संबंधित प्रश्न
If the 9th term of an A.P. is zero, then prove that 29th term is double of 19th term.
Find the sum of the following arithmetic series:
34 + 32 + 30 +...+10
Find the sum of the following arithmetic series:
(-5)+(-8)+(-11)+...+(-230)
Decide whether the following sequence is an A.P., if so find the 20th term of the progression:
–12, –5, 2, 9, 16, 23, 30, ..............
Find the 27th term of the following A.P.
9, 4, –1, –6, –11,...
Six year before, the age of mother was equal to the square of her son's age. Three year hence, her age will be thrice the age of her son then. Find the present ages of the mother and son.
Select the correct alternative and write it.
What is the sum of first n natural numbers ?
Select the correct alternative and write it.
If a share is at premium, then -
For a given A.P. a = 3.5, d = 0, then tn = _______.
Find the 23rd term of the following A.P.: 9, 4,-1,-6,-11.
How many multiples of 4 lie between 10 and 205?
Find tn if a = 20 and d = 3.
Find t5 if a = 3 and d = –3.
12, 16, 20, 24,...... Find 25th term of this A.P.
The nth term of an A.P. 5, 8, 11, 14,...... is 68. Find n = ?
Find a and b so that the numbers a, 7, b, 23 are in A.P.
In an A.P. if the sum of third and seventh term is zero. Find its 5th term.
