Advertisements
Advertisements
प्रश्न
Find the value of a25 – a15 for the AP: 6, 9, 12, 15, ………..
उत्तर
a = 6, d = 3 ;
a25 = 6 + 24(3) = 78
a15 = 6 + 14(3) = 48 ;
∴ a25 – a15 = 78 – 48
= 30
APPEARS IN
संबंधित प्रश्न
Show that a1, a2,..., an... form an AP where an is defined as below:
an = 3 + 4n
Also, find the sum of the first 15 terms.
Find the sum of all integers between 100 and 550, which are divisible by 9.
Find the sum 3 + 11 + 19 + ... + 803
If k,(2k - 1) and (2k - 1) are the three successive terms of an AP, find the value of k.
Write the sum of first n even natural numbers.
If the sum of P terms of an A.P. is q and the sum of q terms is p, then the sum of p + q terms will be
If the sum of first n even natural numbers is equal to k times the sum of first n odd natural numbers, then k =
Find the sum of the first 10 multiples of 6.
In a ‘Mahila Bachat Gat’, Sharvari invested ₹ 2 on first day, ₹ 4 on second day and ₹ 6 on third day. If she saves like this, then what would be her total savings in the month of February 2010?
Find the middle term of the AP. 95, 86, 77, ........, – 247.
