Advertisements
Advertisements
प्रश्न
Choose the correct alternative answer for the following question .
First four terms of an A.P. are ....., whose first term is –2 and common difference is –2.
विकल्प
-2,0,2,4
-2,4 ,-8,16
-2, -4,-6,-8
-2, -4 ,-8,-16
उत्तर
It is given that,
First term (a) = –2
Common difference (d) = –2
Second term = a + d = –2 + (–2) = –4
Third term = a + 2d = –2 + 2(–2) = –6
Fourth term = a + 3d = –2 + 3(–2) = –8
Thus, first four terms of the A.P. are –2, –4, –6, –8
APPEARS IN
संबंधित प्रश्न
Find the sum of the odd numbers between 0 and 50.
The sum of the third and the seventh terms of an AP is 6 and their product is 8. Find the sum of first sixteen terms of the AP.
Find the sum of the following arithmetic progressions:
`(x - y)/(x + y),(3x - 2y)/(x + y), (5x - 3y)/(x + y)`, .....to n terms
Find the sum of the following arithmetic progressions:
−26, −24, −22, …. to 36 terms
Find the sum of the first 11 terms of the A.P : 2, 6, 10, 14, ...
If 4 times the 4th term of an AP is equal to 18 times its 18th term then find its 22nd term.
Find the value of x for which (x + 2), 2x, ()2x + 3) are three consecutive terms of an AP.
If the numbers a, 9, b, 25 from an AP, find a and b.
Find the first term and common difference for the A.P.
`1/4,3/4,5/4,7/4,...`
The A.P. in which 4th term is –15 and 9th term is –30. Find the sum of the first 10 numbers.
What is the sum of first 10 terms of the A. P. 15,10,5,........?
The sum of the first 7 terms of an A.P. is 63 and the sum of its next 7 terms is 161. Find the 28th term of this A.P.
Write the sum of first n odd natural numbers.
An article can be bought by paying Rs. 28,000 at once or by making 12 monthly installments. If the first installment paid is Rs. 3,000 and every other installment is Rs. 100 less than the previous one, find:
- amount of installments paid in the 9th month.
- total amount paid in the installment scheme.
A manufacturer of TV sets produces 600 units in the third year and 700 units in the 7th year. Assuming that the production increases uniformly by a fixed number every year, find:
- the production in the first year.
- the production in the 10th year.
- the total production in 7 years.
Q.7
Q.10
Show that a1, a2, a3, … form an A.P. where an is defined as an = 3 + 4n. Also find the sum of first 15 terms.
Find the middle term of the AP. 95, 86, 77, ........, – 247.
