Advertisements
Advertisements
प्रश्न
The sum of 25 terms of A.P. 8 + 12 + 16 + .... is ______.
पर्याय
1400
1600
1800
2000
MCQ
रिकाम्या जागा भरा
Advertisements
उत्तर
The sum of 25 terms of A.P. 8 + 12 + 16 + .... is 1400.
Explanation:
a = 8
d = 12 − 8
= 4
n = 25
`S_n = n/2[2a + (n - 1)d]`
`S_25 = 25/2[2(8) + (25 - 1)4]`
`S_25 = 25/2[16 + (24)4]`
`S_25 = 25/2[16 + 96]`
`S_25 = 25/2[112]`
S25 = 25 × 56
S25 = 1400
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
