.Find the sum of the first 50 common terms of 12, 16, 20,.... and 18, 24, 30,....
Answers
Answered by
1
Answer:
Step-by-step explanation:
Sn=n/2{ 2a +(n-1)d}
n=50
a=12
d=4
sn=50/2[2(12) +(50-1)4]
Sn=25[24+196*4]
Sn=25[808
Sn=20,200
Answered by
0
Answer:
5500,8250
Step-by-step explanation:
1) AP: 12,16,20
a50=a+49d
=12+49
=12+196
a50=208
S50=n/2(a+l)
=50/2(12+208)
=25(220)
S50=5500
Therefore sum 50 of terms in this APis 5500
2)AP:16,24,30
a50=a+49d
=16+49(6)
=16+294
a50=312
S50=n/2(a+l)
=25(16+312)
=25(330)
=8250
Therefore sum of 50 terms In this AP is 8250
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