Advertisements
Advertisements
प्रश्न
Complete the following activity to find the number of natural numbers between 1 and 171, which are divisible by 5:
Activity :
उत्तर
a = 5 , d = 10 - 5 = 5 , tn = 170
tn = a + (n - 1)d
170 = 5 + (n - 1) × 5
170 = 5 + 5n - 5
170 = 5n
n = 34
APPEARS IN
संबंधित प्रश्न
Find the sum of all three-digits natural numbers which are divisible by 13.
In an AP, the first term is 22, nth terms is -11 and sum of first n terms is 66. Find the n and hence find the4 common difference.
The 12th term of an AP is -13 and the sum of its first four terms is 24. Find the sum of its first 10 terms.
The sum of the first 7 terms of an AP is 182. If its 4th and 17th terms are in the ratio 1:5, find the AP.
The sum of the first 9 terms of an AP is 81 and that of its first 20 terms is 400. Find the first term and common difference of the AP.
An AP 8, 10, 12, … has 60 terms. Find its last term. Hence, find the sum of its last 10 terms.
Sum of the first 14 terms of and AP is 1505 and its first term is 10. Find its 25th term.
There are 25 trees at equal distance of 5 m in a line with a water tank, the distance of the
water tank from the nearest tree being 10 m. A gardener waters all the trees separately,
starting from the water tank and returning back to the water tank after watering each tree to get water for the next. Find the total distance covered by the gardener in order to water all the trees.
Which of the following sequences are A.P.? If they are A.P. find the common difference.
Is the following sequences are A.P.? If is A.P. find the common difference.
0, –4, –8, –12,...
Write the correct number in the given boxes from the following A. P.
–3, –8, –13, –18,...
Here t3 = 
, t2 = 
, t4 =
, t1 = 
,
t2 – t1 = 
, t3 – t2 = 
∴ a = 
, d = 
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?
Find the class-mark of 80-90.
Write a trinomial of degree 7.
Write a trinomial of degree 7.
Yogesh requires 3 days more than Vivek to do a work completely. If both
of them work together, the work can be completed in 2 days. Find the
number of days required for each of them to do the work completely.
Solve any four of the following.
If x is the geometric mean of 16 and 9, find x.
If for an A.P. the first term is 2 and the common difference is 3, then find first three-term of A.P.
